Phillips, Celeste R.
Mosby , 1996
Buku Teks
Goode, William J.
Prentice-Hall, 1964
Buku Teks
FleiBer, Marieluise
Munchen Suhrkamp 1979
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Pike, Kenneth L. (Kenneth Lee), 1912-2000
Ablex Publishing, 1983
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Rao, K. Sreenivasa
Springer, 2012
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