Kay, John, author
Public Affairs, 2016
Buku Teks
Solomon, Michael R., author
Prentice Hall International, 1997
Buku Teks
Solomon, Michael R., author
Pearson education, 2015
Buku Teks
Brueggeman, William B., author
McGraw-Hill Irwin, 2011
Buku Teks
Glickman, Edward A., author
Academic Press, 2014
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