Burns, James McGregor
Prentice-Hall, 1972
Buku Teks
Newell, Kenneth W.
World Health Organization, 1975
Buku Teks
Miller, Wright
E.P. Dutton, 1961
Buku Teks
Burns, James McGregor
Prentice-Hall, 1989
Buku Teks
Colman, James
Angus and Robertson, 1971
Buku Teks