Puetz, Belinda E., author
Aspen Publishers, 1981
Buku Teks
Delphin, Patricia
Virgnia Reston publishing 1983 , 1983
Buku Teks
Hale, Tammy J., author
Delmar, 2011
Buku Teks
Knowles, Malcolm S., author
Association Press, 1976
Buku Teks
Robinson, Kate, author
Open University Press, 1995
Buku Teks