Miner, John B., author
McGraw-Hill, 1992
Buku Teks
Bobko, Philip, author
McGraw-Hill, 1995
Buku Teks
Aamodt, Michael G., author
Wadsworth and Cengage Learning, 2013
Buku Teks
Blum, Milton L., author
Harper & Brothers , 1956
Buku Teks
Muchinsky, Paul M., author
Wadsworth, 2000
Buku Teks