POUGH, F. Harvey - JANIS, Christine M. - HEISER, John B. Vertebrate life. 8th ed. San Francisco : Benjamin Cummings, 2009. xiv, 688 s. Dostupné na internetu: <http://www.loc.gov/catdir/toc/ecip0822/2008028645.html> ISBN 978-0-321-54576-3.