<cite class="book" style="font-style:normal">Roger D. Launius; J.D. Hunley (July 1994)      <i> An Annotated Bibiography of the Apollo Program</i>, Monographs in Aerospace History, No. 2, NASA  <small>SP-2015-4502, N94-34668, NASA-TM-109852</small></cite>
NASA/Roger D. Launius and J. D. Hunley
<a rel="nofollow" class="external free" href="https://ntrs.nasa.gov/api/citations/19940030162/downloads/19940030162.pdf">https://ntrs.nasa.gov/api/citations/19940030162/downloads/19940030162.pdf</a>; see also <a rel="nofollow" class="external free" href="https://history.nasa.gov/monograph2.pdf">https://history.nasa.gov/monograph2.pdf</a>