Bitter, Gary G., author
Allyn and Bacon, 1989
Buku Teks
Kenyon, Anne E.
Prentice-Hall, 1969
Buku Teks
Heckenbach, Alan J., author
Macmillan, 1970
Buku Teks
Devine, Donald F., author
John Wiley & Sons, 1977
Buku Teks
Hutchison, Donald, author
McGraw-Hill , 2000
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