<cite class="book" style="font-style:normal">Gene L. Waltman (2000)      <i> Black Magic and Gremlins: Analog Flight Simulations at NASA's Flight Research Center</i>, Monographs in Aerospace History, No. 20, NASA  <small>SP-2000-4520</small></cite>
NASA/Gene L. Waltman
<a rel="nofollow" class="external free" href="https://www.nasa.gov/centers/dryden/pdf/88787main_Black_Magic.pdf">https://www.nasa.gov/centers/dryden/pdf/88787main_Black_Magic.pdf</a>