Megginson, William L, Mary Jane Byrd, Charles R. Scott, Leon C. Megginson
Irwin, 1997
Buku Referensi
Hodgetts, Richard M.
Harcourt College Publishers, 2001
Buku Teks
Hatten, Timothy S.
South Western Cengage Learning, 2012
Buku Teks
Katz, Jerome
McGraw-Hill, 2014
Buku Teks
Hodgetts, Richard M.
John Wiley & Sons, 2002
Buku Teks