Gusikoff, Lynne
Facts on File Publications, 1984
Buku Teks
Dallin, Leon
WM. C. Brown Co. Pub., 1965
Buku Teks
Drotning, Phillip T., author
Doubleday, 1968
Buku Teks
Clark, William S., author
Houghton-Miffiln, 1987
Buku Teks
Robins, C. Richard, author
Houghton-Miffiln, 1986
Buku Teks