Ewles, Linda, author
Scutari Press, 1995
Buku Referensi
Hughes, Rebecca, contributing writher; Chasnoff, Ira J., consultan; Ellis, Jeffrey W., consultan; Fainman, Zachary S., consultan; McDermott, Teri J., consultan
Publications International , 1991
Buku Referensi
Williams, Norma
Tiger Books International, 1990
Buku Referensi
Carlson, Karen J., author
1996
Multimedia
Carlson, Karen J., author
Harvard University Press, 1996
Multimedia