Dietsch, Betty Mattix
McGraw-Hill, 2003
Buku Teks SO
Holladay, Sylvia A.
Prentice-Hall, 1981
Buku Teks SO
Guth, Hans P.
Wadsworth, 1969
Buku Teks SO
Connelly, Mark
Wadsworth and Cengage Learning, 2013
Buku Teks SO
Little, Brown And Company, 1982
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