Leigh, Denis
M.T.P. Press, 1977
Buku Referensi
Encyclopaedia Britannica, 2002
Buku Referensi
Routledge, 2000
Buku Referensi
edited by W. Gellert, S. Gottwald, M. Hellwich, H. Kastner, H. Kustner
Van Nostrand Reinhold, 1989
Buku Referensi
Decker, Jefferson, author
Oxford University Press, 2016
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