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Buku Referensi
Page One Publishing, [date of publication not identified]
Buku Referensi
Dittrich, Guy, editor
teNeues, 2006
Buku Referensi
edited by martin Nicholas Kunz
teNeues, 2003
Buku Teks SO
editor, Roger L. Brockenbrough, Frederick S. Maerritt
McGraw-Hill, 1994
Buku Referensi