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Amacom , 1974
Buku Teks
Hodgetts, Richard M., author
Harcourt College Publishers, 2001
Buku Teks
Hatten, Timothy S., author
South Western Cengage Learning, 2012
Buku Teks
Katz, Jerome, author
McGraw-Hill, 2014
Buku Teks
Hodgetts, Richard M., author
John Wiley & Sons, 2002
Buku Teks