edited by Marshall W. Raffel
The Pennsylvania State University, 1984
Buku Teks
Ahmad Sulaiman, author
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Roemer, Milton I., author
Oxford University Press, 1991
Buku Referensi
Callan, Mary F., author
McGraw-Hill, 1991
Buku Teks
edited by Richard H. Egdahl and Diana Chapman Walsh
Springer-Verlag, 1979
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