Megginson, William L, Mary Jane Byrd, Charles R. Scott, Leon C. Megginson
Irwin, 1997
Buku Referensi
Hodgetts, Richard M.
John Wiley & Sons, 2002
Buku Teks
Ogawa, Eiji
[Publisher not identified], 1994
Buku Teks
Hodgetts, Richard M.
Harcourt College Publishers, 2001
Buku Teks
Hatten, Timothy S.
South Western Cengage Learning, 2012
Buku Teks