edited by Charles E. Schaefer and Kevin J. O'Connor
John Wiley & Sons, 1982
Buku Referensi
Carmichael, Karla D., author
Pearson - Prentice Hall, 2006
Buku Teks
Heinemann, David, author
Terling Paperbacks, 2003
Buku Teks
Houston, Gaie, author
Sage, 2003
Buku Teks
Salvo, Susan G.
Elsevier Saunders, 2012
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