Artikel Jurnal
Holt, Robert T., author
University of Minnesota Press, 1958
Buku Teks
Moore, Wilbert E. (Wilbert Ellis), author
Geneve League of Natins 1945,
Buku Teks
edited by Maggie Toy
Academy Editions, 1996
Buku Teks
Alenka Selih
Springer, 2012
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