edited by D.R. Fraser Taylor
John Wiley & Sons, 1980
Buku Teks
Lathrop, Thomas G.
Wadsworth, 1967
Buku Teks
Miller, G. Tyler (George Tyler), 1931-
Wadsworth, 1991
Buku Teks
Kuratko, Donald F.
Harcourt College Publishers, 2001
Buku Teks
Bailey, Edward P.
Charles E. Merrill, 1984
Buku Teks