Easterbrook, Don J.
Macmillan Publishing Company, 1993
Buku Teks
Ahmad Andri Gribaldi, author
1995
UI - Skripsi (Membership)
Easterbrook, Don J.
Prentice-Hall, 1999
Buku Teks
Astrid Damayanti, author
Direktorat Riset dan Pengabdian Masyarakat Universitas Indonesia, 2008
Artikel Jurnal
Amalia Fathiningrum, author
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UI - Skripsi (Membership)