Bossing, Nelson L.
Laidlaw Brothers, 1956
Buku Teks SO
edited by Thom Brooks
Blackwell, 2008
Buku Teks SO
Hall, J. Oliver
America Book Company, 1958
Buku Teks SO
edited by Dov Ronen
Lynne Rienner, 1986
Buku Teks SO
Hukum dan Pembangunan, XXVIII (4) Juli Agustus 1998: 252-261, 1998
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