Gordon, Sheldon P., author
McGraw-Hill, 1994
Buku Teks
edited by D.R. Fraser Taylor
John Wiley & Sons, 1980
Buku Teks
Lathrop, Thomas G., author
Wadsworth, 1967
Buku Teks
Miller, G. Tyler (George Tyler), 1931-, author
Wadsworth, 1991
Buku Teks
Kuratko, Donald F., author
Harcourt College Publishers, 2001
Buku Teks