general editors Michael Orme, Susanna Graham-Jones
Penguin Group, 1989
Buku Referensi
Woodham, Anne, author
Health Educatons Authority, 1994
Buku Referensi
Levine, Glenn N., author
Appleton and Lange, 1993
Buku Teks
Michael Lewis, Lisa Kestler, editor
American Psychological Association, 2012
Buku Teks
Skidmore-Roth, Linda, author
Mosby/Elsevier, 2009
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