Dewar, Diane M.
Jones & Bartlett Learning, 2010
Buku Teks
Newbrander, William
World Health Organization, 1992
Buku Teks
Crane, Burton
Harcourt, Brace and Company, 1956
Buku Teks
Reynold, Lloyd George
McGraw-Hill, 1981
Buku Teks
Cauley, Troy Jesse
International Textbook, Co., 1968
Buku Teks