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The Ronald Press, 1965
Buku Teks SO
Ahrens, C. Donald
Thomson, Brooks/Cole, 2007
Buku Teks
Baar, James, 1929-
Harcourt, Brace & World, c1962
Buku Teks
Springer New York, 2019
eBooks
Syaifudin Zuchri
Fakultas Hukum Universitas Indonesia, 1998
UI - Skripsi Membership