Luthans, Fred, author
McGraw-Hill, 1981
Buku Teks
Ott, J. Steven, author
Thomson Wadsworth, 2008
Buku Teks
Herbert, Theodore T., author
Macmillan, 1976
Buku Teks
Little, Brown & Co., 1986
Buku Teks
Cummings, L.L., author
Richard D. Irwin, 1980
Buku Teks