Evans, Bergen, 1904-, author
Random House, 1957
Buku Referensi
chief editor, Paul Procter
Longman, 1982
Buku Referensi
Burickson, Sherwin, author
Philosophical Library, 1959
Buku Referensi
Pearson Longman, 2006
Buku Referensi
Pearson Education, 2005
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