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
Proximore, Senator William
Henry Regnery, 1964
Buku Teks