Apollo programm : Display and Keyboard (DSKY) of the Primary Guidance System (french comments
<a href="//commons.wikimedia.org/wiki/User:Pline" title="User:Pline">Pline</a>
<a rel="nofollow" class="external text" href="http://www.hq.nasa.gov/alsj/LMSysHandbk.pdf">Apollo Operations Handbook, Lunar Module, LM 10 and Subsequent, Volume I, Subsystems Data</a>