<a href="https://en.wikipedia.org/wiki/Betsy_Humphreys" class="extiw" title="en:Betsy Humphreys">Betsy Humphreys</a>, Duane Arenales, Richard Dick, PhD, Grace McCarn, John Cox, Laura Kassebaum, Lillian Kozuma, and Joseph Leiter, PhD
National Library of Medicine (U.S.), publisher.
<a rel="nofollow" class="external free" href="http://resource.nlm.nih.gov/101707336">http://resource.nlm.nih.gov/101707336</a>