Caplen, Rowland
Business Books , 1975
Buku Teks
Hansen, Bertrand L., author
Prentice-Hall, 1966
Buku Teks
Kateman, G., author
John Wiley & Sons, 1981
Buku Teks
Grant, Eugene L. (Eugene Lodewick), author
McGraw-Hill, 1988
Buku Teks
Pond, Robert J., author
Maxwell Macmillan, 1994
Buku Teks