Armstrong, Michael
Crest Publishing House, 1999
Buku Teks
McGraw-Hill, Irwin, 2003
Buku Teks
Bohlander, George W.
South Western Cengage Learning, 2013
Buku Teks
Dessler, Gary, 1942-
Pearson, 2015
Buku Teks
Dessler, Gary, 1942-
Pearson Education, 2015
Buku Teks