Artikel Jurnal
Sofwan Noerwidi, author
Balai Arkeologi D.I Yogyakarta, 2017
Artikel Jurnal
Cambridge University Press, 2013
Buku Teks
by Cleveland P. Hickman, Jr. [and others]
McGraw-Hill, 2012
Buku Teks
Garnadi Prawirosudirdjo
Bhratara, 1969
Buku Referensi