Molyneux, Maxine, author
International Labout Office, 1982
Buku Teks
Shabad, Theodore, author
Frederick A. Praeger, 1956
Buku Teks
The Unesco Press, 1979
Buku Teks
Wang, K.P.
Westview Press, 1977
Buku Teks
Grumbine, R. Edward, author
[, IslanPress], 2012
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