editors, Tim Halliday, Kraig Adler, Christopher O'toole
Grolier International, 1993
Buku Referensi
edited by Arthur C. Giese, John S. Pearse and Vicki B. Pearse
Blackwell Scientific , 1987
Buku Teks
Russell-Hunter, W.D.
Macmillan Publishing Co., 1979
Buku Teks
Frye, Frederic L.
Krieger Publishing , 1992
Buku Teks
edited by Arthur C. Giese, John S. Pearse and Vicki B. Pearse
Boxwood Press, 1991
Buku Teks