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Walck, 1969
Buku Teks
Ellis, Harry B., author
World Pub., 1965
Buku Teks
Artikel Jurnal
Bellamy, C. W.
Sweet and Maxwell, 1978
Buku Teks
Siti Nurandini Winduningtyas, author
Universitas Indonesia, 2013
UI - Tesis (Membership)