Freedman, Amy L., author
Routledge, 2000
Buku Teks
edited by Edgar T. Thompson, Robert E. Park
Duke University Press, 1939
Buku Teks
Brown, Ina Corinne
Prentice-Hall, 1973
Buku Teks
Aguirre, Adalberto, author
McGraw-Hill, Higher Education, 2009
Buku Teks
Schrieke, Bertram Johannes Otto, author
Viking Press, 1936
Buku Teks