Videbeck, Sheila L., author
Lippincott, 2001
Buku Teks
Lemkau, Paul V.
McGraw-Hill Book Company, INC, 1955
Buku Teks
Peter Aggleton, Jane Hurry, Ian Warwick, editor
John Wiley & Sons, 2000
Buku Teks
Bernard, Harold W.
1970
Buku Teks
edited by Henry Wechsler, Leonard Solomon, Bernard M. Kramer
Holt, Rinehart and Winston, 1970
Buku Teks