Grunwald, Joseph, author
Bookings Institute, 1985
Buku Teks
Levinson, Charles, author
George Allen & Uniwin, 1972
Buku Teks
Root, Franklin R., author
South-Western Publishing, 1978
Buku Teks
edited by John Eade
Routledge, 1997
Buku Teks
Ball, Donald A., author
Irwin/McGraw-Hill, 2002
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