Newell, Kenneth W., author
World Health Organization, 1975
Buku Teks
Miller, Wright
E.P. Dutton, 1961
Buku Teks
Burns, James McGregor, author
Prentice-Hall, 1989
Buku Teks
Colman, James, author
Angus and Robertson, 1971
Buku Teks
Kebric, Robert B., author
Mayfiled, 2000
Buku Teks