Fortes, Meyer, author
The Athlone Press, 1970
Buku Teks
Beattie, John, author
Free Press of Glencoe, 1966
Buku Teks
Murphy, Robert F., author
Prentice-Hall, 1986
Buku Teks
Hammond, Peter, author
Macmillan, 1978
Buku Teks
Rapport, Nigel, author
Routledge, 2000
Buku Teks