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Lea & Febiger, 1981
Buku Teks
Smolensky, Jack
W.B. Saunders Company, 1972
Buku Teks
Intan Kurnia Sari, author
Universitas Indonesia, 2009
UI - Skripsi (Open)
Farmer, R.D.T.
Blackwell Scientific Publ., 1977
Buku Teks
Oxford University Press, 1991
Buku Teks