edited by George M. Foster and Robert V. Kemper
Little, Brown, 1974
Buku Teks SO
Winter, C.F. (Carel Frederik)
Geofferey Cumberlege, 1948
Buku Teks
Fisher, Michael D.
Routledge, 1993
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Sofi Suwaris
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 1994
UI - Skripsi Membership
Leary, Peter
Oxford University Press, 2016
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