Bowley, Arthur
Staples Press, 1948
Buku Teks SO
Johnson, Robert
PWS-Kent, 1984
Buku Teks SO
Christensen, Howard B.
Hoghton Mifflin, 1977
Buku Teks SO
Freund, John E.
Pearson Prentice Hall, 2007
Buku Teks SO
Freund, John E.
Pearson Education, 2007
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