Marsh, PDV
Gower, 1974
Buku Teks
Abramowitz, Ava J., author
John Wiley & Sons, 2002
Buku Teks
Todd, Maria K.
CRC Press, Taylor & Francis Group, 2011
Buku Referensi
Lewicki, Roy J., author
Richard D. Irwin, 1985
Buku Teks
Roy J. Lewicki [and others]
McGraw-Hill, 2003
Buku Teks