Ferdinand F. Stone
Little,Brown and Company, 1952
Buku Teks
Hoebel, E. Adamson, author
Atheneum, 1970
Buku Teks
Ratliff, Richard C.
The Scarecrow Press,Inc., 1972
Buku Teks
Hegland, Kenney
West Pub. Co., 1995
Buku Teks
Hoebel, E. Adamson, author
Harvard University Press, 1967
Buku Teks