compiled and edited by William L. Langer
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Buku Referensi
Rourke Publishing LLC, 2009
Buku Referensi
Sudjoko, author
Proyek Penelitian Purbakala, 1981
Buku Teks
edited by. Richard Garnett
Delhi, India Akashdeep 1992
Buku Referensi
Cambridge University Press, 2013
Buku Teks