Jennings, Jesse D., author
McGraw-Hill, 1972
Buku Teks
Kuper, Adam, author
Routledge, 1996
Buku Teks
Beals, Ralph L., author
Macmillan, 1977
Buku Teks
Beals, Ralph L., author
Macmillan, 1959
Buku Teks
edited by Carleton S. Coon and Edward E. Hunt
Grosset & Dunlap, 1963
Buku Teks