edited by BobbieJean Sweitzer
Lippincott Williams and Wilkins, 2000
Buku Teks
Weber, Janet, author
J.B. Lippincott, 2001
Buku Teks
edited by Diana Odell Potter
Springhouse, 1985
Buku Teks
Groth-Marnat, Gary, author
John Wiley & Sons, 1990
Buku Referensi
edited by Curtiss P. Hansen and Kelley A. Conrad
Quorum Books , 1991
Buku Referensi