Thompson, Kenrick S., author
McGraw-Hill , 1994
Buku Teks
Webster, Andrew, author
Macmillan, 1990
Buku Teks
edited, Hamza Alavi, Teodor Shanin
Macmillan, 1982
Buku Teks
Schaefer, Richard T, author
McGraw-Hill, 2009
Buku Teks
Harvey, Lee, author
Macmillan, 1993
Buku Teks