Gordon, Burgess L., author
Publishing Science Group, Inc., 1975
Buku Referensi
Moisio, Marie A., author
Delmar Cengage Learning, 2010
Buku Teks
Ehrlich, Ann, author
Delmar Cengage Learning, 2012
Multimedia
Shanholtzler, M. Beth, author
McGraw-Hill, 2012
Buku Teks
Sharona Hoffman, author
Cambridge University Press, 2016
eBooks