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South Western Cengage Learning, 2011
Buku Teks
Fryar, Maridell
National Textbook Co., 1979
Buku Teks
Kruger, Arthur N.
The Scarecrow Press, Inc., 1968
Buku Teks
Rojali, author
2020
UI - Makalah dan Kertas Kerja
Jacobson, Michael D., author
Routledge, 1987
Buku Teks