edited by Clarence E. Thurber
Duke University Press, 1973
Buku Teks
Szulc, Tad
Atheneum, 1966
Buku Teks SO
Szulc, Tad
Atheneum, 1966
Buku Teks SO
edited by Eduardo P. Archetti
MacMillan Education, 1987
Buku Teks SO
Weston, Paul B.
Prentice-Hall, 1977
Buku Teks