Foote, Caleb, author
Little, Brown, 1980
Buku Teks
Wyat, John W.
McGraw-Hill, 1963
Buku Teks
Foote, Caleb, author
Little, Brown, 1976
Buku Teks
Barendt, E. M., author
Pearson, 2000
Buku Teks
Mason, J. Barry, author
Business Publications, 1987
Buku Teks