Levinson, Charles
George Allen & Uniwin, 1972
Buku Teks SO
Root, Franklin R.
South-Western Publishing, 1978
Buku Teks SO
Root, Franklin R.
South-Western Publishing, 1978
Buku Teks SO
edited by John Eade
Routledge, 1997
Buku Teks SO
Ball, Donald A.
Irwin, McGraw-Hill, 2002
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