Meier, Kenneth J., author
Thomson wadsworth, 2007
Buku Teks
Sargent, Lyman Tower, author
Thomson Wadsworth , 2006
Buku Teks
Aristotles, author
Modern Library, 1943
Buku Teks
Deutsch, Karl W
Houghton Mifflin, 1970
Buku Teks
Soltau, Roger H.
Longmans, Green , 1951
Buku Teks