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Buku Teks
Kubly, Herbert
Time Incoprated, 1961
Buku Teks
Black, Christopher F., author
Routledge, 2001
Buku Teks
Burke, Peter, author
Princeton University Press, 1986
Buku Teks
Greita Anggraeni, author
Universitas Indonesia, 2016
UI - Skripsi (Membership)