Nolan-Haley, Jacqueline M., author
West, 1992
Buku Teks
Averill, Lawrence H.
West Publishing Company, 1978
Buku Teks
Gellhorn, Ernest, author
West Publishing Company, 1972
Buku Teks
Leslie, Douglas L., author
West Publishing Company, 1979
Buku Teks
Gellhorn, Ernest, author
West, 2004
Buku Teks