Balbach, Margaret
Brace Jovanovich College, 1991
Buku Teks
Cooper, Melanie M.
McGraw-Hill, 2009
Buku Teks SO
Scheinfein, Michael
Kendall/Hunt, 1993
Buku Teks SO
Scheinfein, Michael
Kendall/Hunt, 1993
Buku Teks SO
Green, Michael
CSH Press, 2012
Buku Teks