Kendall, Maurice, Sir, author
Charles Griffin, 1975
Buku Teks
Giles, David C., author
Routledge, 2002
Buku Teks
Scholz, Roland W., author
Sage, 2002
Buku Teks
Departemen Kesehatan, 1999
Buku Teks
Anderson, James A., author
McGraw-Hill, 1987
Buku Teks