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Penguin Books, 1968
Buku Teks
Keay, Frederick, author
Pergamon Press, 1972
Buku Teks
Lancaster, Geoffrey A.
Macmillan, 1985
Buku Teks
Venezia Ryanka Sutrisno, author
Fakultas Ilmu Komputer Universitas Indonesia, 2013
UI - Skripsi (Membership)
Linda Stepvhanie, author
Fakultas Teknik Universitas Indonesia, 2012
UI - Skripsi (Open)