Garvey, Justine S.
The Benjamin/Cummings , 1977
Buku Teks
Seidman, Lisa A., author
Prentice-Hall, 2000
Buku Teks
Reilley, Charles N.
McGraw-Hill, 1961
Buku Referensi
World Health Organization, 1991
Buku Teks
Copeland, Robert Allen, author
Chapman & Hall, 1993
Buku Teks