Hammond, Peter, author
Macmillan, 1978
Buku Teks
Tavistock Publications, 1968
Buku Teks
Swift, M. G., author
Universiti Kebangsaan Malaysia, 2001
Buku Teks
edited by Edwin Ardener
Tavistock , 1971
Buku Teks
Nadel, S.F. (Siegfried Frederick), author
Cohen & West, 1969
Buku Teks