Sally B. Olds, Marcia L. London, Patricia A. Wieland Ladewig, Michele R. Davidson
Pearson Education, 2004
Buku Referensi
Peterson, Veronica, author
Elsevier Mosby, 2013
Buku Teks
Barash, Paul G., author
Lippincott - Raven Publishers, 1997
Buku Referensi
edited by W.A. Paton
Ronald Press, 1955
Buku Teks
editor, Harry Helms [and others]
McGraw-Hill, 1983
Buku Referensi