Itule, Bruce D., author
McGraw-Hill, 1994
Buku Teks
Charnley, Mitchell V., author
Holt, Rinehart and Wisnton, 1965
Buku Teks
Rich, Carole, author
Wadsworth and Cengage Learning, 2010
Buku Teks
MacDougall, Curtis D., author
Macmilan Co., 1972
Buku Teks
Danilov, Victor J. author
Macmillan, 1955
Buku Teks