De Rougemont, Denis, author
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Buku Teks
Katzen, May
Unesco Press, 1975
Buku Teks
Ina Sastrawardoyo, author
Universitas Indonesia, 1987
UI - Skripsi (Membership)
May, Brian
Graham Brash, 1978
Buku Teks
May, Tim, author
Open University Press, 2001
Buku Referensi