Clements, Richard Barret, author
Prentice-Hall, 1994
Buku Referensi
Prentice-Hall, 1981
Buku Teks
Lenk, John D., author
Prentice-Hall, 1978
Buku Referensi
edited by Klaus R. Scherer, Paul Ekman
Cambridge University Press, 1982
Buku Referensi
Richard G. Seymour, editor
Edward Elgar, 2012
Buku Teks