Thurlow, Richard, author
Cambridge University Press, 1999
Buku Teks
Griffin, Roger, author
Routledge, 1994
Buku Teks
Ebenstein, William, author
Prentice-Hall, 1967
Buku Teks
Ebenstein, William, author
Prentice-Hall, 1954
Buku Teks
Antic, Ana, author
Oxford University Press, 2017
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