Lewis, C.D., author
Butterworth, 1970
Buku Teks
Buchman, Joseph, author
Englewood Cliffs, NJ, Prentice-Hall
Buku Teks
Love, Stephen F., author
McGraw-Hill, 1979
Buku Teks
Carrol, Phil, author
New York, N.Y., McGraw-Hill
Buku Teks
Brown, Robert G., author
McGraw-Hill, 1959
Buku Teks