Barton, Jonathan R.
Routledge, 1997
Buku Teks
Carlson, Fred A., author
Prentice-Hall, 1952
Buku Teks
edited by Eduardo P. Archetti
MacMillan Education, 1987
Buku Teks
Szulc, Tad, author
Atheneum, 1966
Buku Teks
Szulc, Tad, author
Atheneum, 1966
Buku Teks