edited by Moryteza Honari and Thomas Boleyn
Routledge, 1999
Buku Teks
Meyer, Evelyn E.
World Health Organization, 1975
Buku Teks
Treshow, Michael, author
McGraw-Hill, 1976
Buku Teks
edited by Jonathan Rigg
Archipelago Press, 1996
Buku Teks
Knapp, Brian, author
Longman House, 1992
Buku Teks