Langen, Eugen
A.W.Sijthoff, 1973
Buku Teks
Bermann, George A., author
Thomson, 2003
Buku Teks
Philip Reichel, editor; Jay Albanese, editor
Sage , 2014
Buku Referensi
Marmo, Marinella, author
Sage, 2016
Buku Teks
Paiement, Phillip, author
Cambridge University Press, 2017
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