Aboyade, Ojetunji, author
Addison-Wesley, 1983
Buku Teks
Myint, Hla, author
Hutchinson University Library, 1973
Buku Teks
edited by Kenneth Lee, Anne Mills
Oxford University Press, 1984
Buku Teks
Nafziger, E. Wayne, author
Prentice-Hall, 1990
Buku Teks
Newbrander, William, author
World Health Organization, 1992
Buku Teks