Keast, David N.
McGraw-Hill, 1967
Buku Teks
Cook, David I., author
International Textbook Company, 1961
Buku Teks
Singer, Ferdinand L., author
New York: Harper and Row, 1975
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Meriam, J. L. (James L.), author
John Wiley & Sons, 1959
Buku Teks
Meriam, J.L. (James L.), author
John Wiley & Sons, 1978
Buku Teks