O`Brien, Robert W.
Houghton Mifflin, 1964
Buku Teks
Broom, Leonard
Harper & Row, 1977
Buku Teks
Broom, Leonard
Harper & Row , 1963
Buku Teks
edited by Paul B. Horton and Gerald R. Leslie
Prentice-Hall, 1975
Buku Teks
edited by Nicole Woosley Biggart
Blackwell, 2002
Buku Teks