Crowley, Tony
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Buku Teks SO
edited by Edward Conze
Bruno Cassirer, 1954
Buku Teks SO
Kirk, G.S. (Geoffrey Stephen), 1921-
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Buku Teks SO
Sakamoto, Taro
International Society for Educational Information Press, 1984
Buku Teks SO
edited by John A. Wolter and Ronald E. Grim
Library of Congress, 1977
Buku Referensi