Three-view drawing of De Havilland DH.18 with Napier Lion engine.
<i>Flight</i>
1921-03-24
<a rel="nofollow" class="external text" href="https://www.flightglobal.com/pdfarchive/view/1921/1921%20-%200204.html"><i>Flight</i>, vol. XIII, no. 12, p. 204, "The D.H. 18 Limousine".</a>