McKenzie, James F., author
Jones and Bartlett, 2005
Buku Teks
Clark, Mary Jo, author
Appleton & lange , 1999
Buku Teks
Freeman, Ruth B., author
W.B. Saunders, 1981
Buku Teks
edited by Robert D. Newcomb, Jerry L. Jolley
Charles C. Thomas, 1980
Buku Teks
Buku Teks