Garstens, Helen L., author
Macmillan, 1969
Buku Teks
Beckmann, Sybilla, author
Pearson Addison Wesley, 2008
Buku Teks
Bennett, Albert B., author
McGraw-Hill , 2001
Buku Teks
Musser, Gary L., author
John Wiley & Sons, 2006
Buku Teks
May, Lola June
The Free Press, 1970
Buku Teks