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Artikel Jurnal
Muhammad AS Hikam, author
Indonesia Defense University, 2018
Artikel Jurnal
Schaller, Lyle E., author
Nashville-Abingdon Press , 1966
Buku Teks
edited by Fred M. Cox [and others]
FE Peacock, 1979
Buku Teks
edited by Ralph M. Kramer and Harry Specht
Prentice-Hall, 1969
Buku Teks