Kuratko, Donald F.
Harcourt College Publishers, 2001
Buku Teks
Steinhoff, Dan
McGraw-Hill, 1979
Buku Teks
edited by Gary Hoover, Alta Campbell, Patrick Spain
The Reference Press, 1991
Buku Referensi
by Howard H. Stevenson ... [et al.]
Irwin McGraw-Hill, 2000
Buku Teks SO
McGraw-Hill, 2001
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