edited by J.F. White
Prentice-Hall, 1962
Buku Teks
Wilson, Gilbert, author
George Allen, 1982
Buku Teks
Pasya Damadyakta, author
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UI - Skripsi (Membership)
Butler, B.C.M., author
Longman Scientific & Technical , 1988
Buku Teks
edited by Sybil P. Parker
McGraw-Hill, 1988
Buku Referensi