Penn, Ira A., author
Gower, 1998
Buku Teks
Johnson, Mina Marie, 1920-, author
South-Western Pub., 1982
Buku Teks
Smith, Read-Judith, author
South-Western, 2002
Buku Teks
Shepherd, Elizabeth J., 1960-, author
London, Facet
Buku Referensi
Shepherd, Elizabeth J., 1960-, author
Facet Publishing, 2003
Buku Referensi