Drake, Brett, author
Pearson, 2008
Buku Teks
Ferguson, Elizabeth A., author
J.B. Lippincott, 1975
Buku Teks
Zastrow, Charles, author
Dorsey Press, 1985
Buku Teks
Geeorge Allen , 1971
Buku Teks
edited by Frederic G. Reamer
Columbia University Press, 1994
Buku Teks