Muchinsky, Paul M., author
Wadsworth, 2000
Buku Teks
Aamodt, Michael G., author
Cengage Learning, 2016
Buku Teks
Riggio, Ronald E., author
Pearson, 2009
Buku Teks
Smith, Henry Clay
McGraw-Hill , 1955
Buku Teks
Aamodt, Michael G., author
Thomson/Wadsworth, 2004
Buku Teks