Mints, Lloyd W., author
University of Chicago Press, 1956
Buku Teks
Ballin, Marianne F.H. Hirsch, author
[T. M. C. Asser Press, T. M. C. Asser Press], 2012
eBooks
Martens, Stephanie B., author
Palgrave Macmillan, 2016
Buku Teks
Frankel, Joseph
bina Aksara, 1988
Buku Teks
Artikel Jurnal