Fairbanks, Ralph W., author
Prentice-Hall, 1956
Buku Teks
Fruehling, Rosemary T., author
McGraw-Hill, 1987
Buku Teks
Bell, William D., author
McGraw-Hill, 1957
Buku Teks
Rowley, Jennifer
Kogan Page, 1991
Buku Teks
Levin, Howard S., author
John Wiley & Sons, 1956
Buku Teks