Fell-Carlson, Deborah L., author
Thomson/Delmar Learning, 2008
Buku Teks
Ewles, Linda, author
Scutari Press, 1995
Buku Referensi
Rorden, Judith Waring, author
W.B. Saunders Company, 1987
Buku Teks
Dadzie, Stella
National Institute of Adult Continuing Education, 1993
Buku Teks
Jones, Andrew, author
Radcliffe Publishing, 2009
Buku Teks