Colander, David C., author
McGraw-Hill, 2004
Buku Teks
Wright, David McCord, 1909-, author
Macmillan, 1955
Buku Teks
Isaacs, Asher, 1902-1963, author
Dryden Press, 1952
Buku Teks
Abbott, Lawrence, author
Harcourt, Brace and World, 1967
Buku Teks
Stonier, Alfred W.
Longman Group Limited, 1980
Buku Teks