Gustafon, R. David, author
Thomson Brooks/Cole, 2007
Buku Teks
Beecher, Judith A., author
Pearson - Addison Wesley, 2008
Buku Teks
Young, Cynthia Y., author
John Wiley & Sons, Inc, 2007
Buku Teks
Barrdell, Ross H., author
Addison-Wesley, 1953
Buku Teks
Beckenbach, Edwin F., author
Wadsworth, 1964
Buku Teks