Carison, John G.H.
John Wiley & Sons, 1972
Buku Teks
RMIT University
Palgrave Macmillan, 2012
Buku Teks
Luthans, Fred, author
McGraw-Hill , 1976
Buku Teks
Steers, Richard M., author
Kent Publishing, 1985
Buku Teks
Higgins, James M., author
Macmillan, 1994
Buku Teks