Huzzar, George B, De
Thomas Y.Crowell Company, 1955
Buku Teks
Hazard, John N., author
THe University of Chicago press, 1964
Buku Teks
Garder, Michel
Frederick A. Praeger, 1966
Buku Teks
edited by Alexander Dalllin, Gail W. Lapidus
Westview press, 1991
Buku Teks
Dallin, David
Hollis & Carter, 1949
Buku Teks