Juhl, P.D.
Princeton University Press, 1980
Buku Teks
Castle, Gregory, author
Blackwell, 2007
Buku Teks
Bertens, Hans, author
Taylor & Francis Group, 2008
Buku Teks
Ayers, David, author
Blackwell Publishing, 2008
Buku Teks
Routledge, 1989
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