diff --git a/peripherals/ethernet.tex b/peripherals/ethernet.tex
index 054c7fcdae879e6d2259079506502d10d922eab2..8db08499af67b1e9148633666a6f9c07636e1f7f 100644
--- a/peripherals/ethernet.tex
+++ b/peripherals/ethernet.tex
@@ -1,7 +1,9 @@
-The STM32F767IZ Nucleo board features a built in PHY, a LAN8742A supporting Full Duplex 100Mbit/s.
+The \href{http://www.st.com/en/evaluation-tools/nucleo-f767zi.html}{STM32F767IZ Nucleo board} features a
+built in PHY, a \href{http://www.digikey.com/product-detail/en/microchip-technology/LAN8742A-CZ/LAN8742A-CZ-ND/4079784}{LAN8742A}
+supporting Full Duplex 100Mbit/s.
 
-The Hokuyo UST-10LX Laser range finder will send its output over ethernet,
-thus the STM32 nucleo board will act receiver.
+The \href{http://www.robotshop.com/en/hokuyo-ust-10lx-scanning-laser-rangefinder.html}{Hokuyo UST-10LX Laser range finder}
+will send its output over ethernet, thus the STM32 nucleo board will act receiver.
 Having ethernet hardware does not solve the problem altogether since the
 protocols and setup required for functional ethernet communication is non-trivial.
 
diff --git a/peripherals/spi.tex b/peripherals/spi.tex
index a91a1cb374f925770fa799e3f6238573e531cdde..91df54873f509ee32308c6635705c722826de5b7 100644
--- a/peripherals/spi.tex
+++ b/peripherals/spi.tex
@@ -23,4 +23,5 @@ will need four GPIO pins set in alternate function mode for SPI. \newline
     $\SI{300}{\meter}$.
 
     Transmissions are made by writing data to a buffer, configuring the transmit parameters and finally
-    writing to a register telling the DW1000 to start transmitting.
+    writing to a register telling the \href{http://www.decawave.com/products/dwm1000-module}{DW1000}
+    to start transmitting.
diff --git a/peripherals/timer.tex b/peripherals/timer.tex
index d141b2de99717bf89b917842fcacced16b130f34..735d1e2d3d6cad6b18a8d51d25c5631ded31121e 100644
--- a/peripherals/timer.tex
+++ b/peripherals/timer.tex
@@ -9,9 +9,10 @@ pulse length of input signals (input capture) or generating output waveforms (ou
 PWM, complementary PWM with dead-time insertion).
 
     \subsubsection{Sonar HC-SR04}
-    On the quadcopter, six ultrasonic sensors will be mounted to serve as collision avoidance.
-    The sensors offer range detection from $\SI{2}{\centi\meter}$ to $\SI{400}{\centi\meter}$ and its operation
-    is not affected by sunlight or black material.
+    On the quadcopter, six ultrasonic sensors, \href{http://www.robotshop.com/en/hc-sr04-ultrasonic-range-finder.html?gclid=CMOxmYTsidACFWricgodt9QG-g}{HC-SR04}
+    will be mounted to serve as collision avoidance. The sensors offer range detection from
+    $\SI{2}{\centi\meter}$ to $\SI{400}{\centi\meter}$ and its operation is not affected by sunlight or
+    black material.
         The sensors come complete with an ultrasonic transmitter and receiver module.
 
     To start a measurement, Trig of SR04 must receive high ($\SI{5}{\volt}$) for at least
diff --git a/peripherals/usart.tex b/peripherals/usart.tex
index 320ea2645f0b193f902acd73dda66080e2d9c968..748c1305a557031b1ee73d2a92b94109f247124b 100644
--- a/peripherals/usart.tex
+++ b/peripherals/usart.tex
@@ -1,6 +1,7 @@
-The built in USART in the STM32F7-NUCLEO supports several communication standards for data transmission.
-Among these are RS-232 which requires two extra lines for communication. A Ready To Send (RTS) and a
-Clear To Send (CTS), which adds a layer of hardware flow control.
+The built in USART in the \href{http://www.st.com/en/evaluation-tools/nucleo-f767zi.html}{STM32F7-NUCLEO}
+supports several communication standards for data transmission. Among these are RS-232 which requires two
+extra lines for communication. A Ready To Send (RTS) and a Clear To Send (CTS), which adds a layer of
+hardware flow control.
 
 \subsubsection{IMU - Inertial Measurement Unit}
     To track the movement of the copter in flight, a stable IMU with minimal swing effect has to be used.
@@ -9,7 +10,7 @@ Clear To Send (CTS), which adds a layer of hardware flow control.
     time. Due to noise and swinging of the gyro while accelerating in any direction, the tracking will be
     skewed while moving up and down the cave. This will result in a faulty scan. \newline
     Xsens Technologies are well known in the industry for producing stable and accurate IMU's. Their
-    product series MTi 1 features all the specifications needed for the copter and was chosen as the
+    product series \href{https://www.xsens.com/products/mti-1-series/}{MTi 1} features all the specifications needed for the copter and was chosen as the
     primary IMU for the project.
 
     \begin{figure}[H]