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Conran Octopus, 2000
Buku Referensi
Berman, Barry, author
Prentice Hall International, 1998
Buku Teks
Smith, Henry, author
Oxford University Press, 1951
Buku Teks
Rachman, David J., author
Prentice-Hall, 1969
Buku Teks
Muhammad Syaiful Aliim, author
2016
UI - Tesis (Membership)