Greenberg, Jerald, author
Pearson Education, 2003
Buku Teks
Bunga, author
2019
UI - Skripsi (Membership)
Chusway, Barry
Elex Media Komputindo, 1995
Buku Teks
F.E. Paecock Publishers, Inc., 1973
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Batten,T. R., author
Oxford University Press, 1978
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