Christman, Luther P.
Westview Press, 1981
Buku Teks
Roman D. Jovey, editor
Health Care and Financial, 2002
Buku Teks SO
edited by Elsa Ramsden
W.B. Saunders, 1999
Buku Teks SO
Buku Teks
Talbott, Shawn M
Lippincott Williams & Wilkins, 2007
Buku Teks SO