Owen, Diane S., author
Harcourt, Brace Jovanovich , 1991
Buku Teks
Brandis, Royall, author
Richard D. Irwin, 1959
Buku Klasik
Hicks, John R., author
The Clarendon Press, 1952
Buku Teks
Hicks, John R., author
Oxford University Press, 1975
Buku Teks
Leftwich, Richard H., author
Business Publications, 1974
Buku Teks