Van Duyn, Julia, author
Reston Publishing Company, Inc ., 1975
Buku Teks
Maxwell, Lee M., author
Pergamon Press, 1971
Buku Teks
Kain, Richard Y., author
Prentice-Hall, 1989
Buku Teks
Stallings, William, author
Pearson Education, 2003
Buku Teks
Wilkinson, Barry, author
Prentice-Hall, 1996
Buku Teks