Fryar, Maridell
National Textbook Co., 1979
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Kruger, Arthur N.
The Scarecrow Press, Inc., 1968
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Jacobson, Michael D.
Routledge, 1987
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Dwi Purwanto
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2021
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Vancil, David L.
Allyn and Bacon, 1993
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