edited by Michael E. Soule
Cambridge University Press, 1987
Buku Teks
Levy, Paul S., author
John Wiley & Sons, 1999
Buku Teks
edited by Graziella Caselli and Alan D. Lopez
Oxford University Press, 1996
Buku Teks
Battle, Dolores E.
Elsevier Mosby, 2012
Buku Teks
Clark, Mary Jo, author
Prentice-Hall, 2003
Buku Teks