Weber, Ron
McGraw-Hill International Book Company, 1982
Buku Teks
Frank, Michael R., author
Amacom, 1980
Buku Teks
Hall, James A., author
Thomson/South-Western, 2011
Buku Teks
Cascarino, Richard, author
John Wiley & Sons, 2007
Buku Teks
Kaufman, Felix
The Ronald Press Co. , 1961
Buku Teks