Coulshed, Veronica, author
Macmillan, 1988
Buku Teks
Zastrow, Charles, author
Dorsey Press, 1985
Buku Teks
Smalley, Ruth Elizabeth, author
Columbia University Press, 1971
Buku Teks
Sheafor, Bradford W., author
Allyn and Bacon, c2000
Buku Teks
Rhodhes, Margaret L., author
Routledge and Kegan Paul, 1986
Buku Teks