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North-Holland , 1971
Buku Teks
Orilia, Lawrence S., author
McGraw-Hill, 1982
Buku Teks
Rory Andharta, author
Universitas Indonesia, 2011
UI - Tesis (Open)
Clifton, H.D.
Auerbach, 1971
Buku Teks
Popkin, Gary S., author
Mifflin Company, 1981
Buku Teks