Hinzler, H.I.R., author
E.J. Brill/Leiden University Press, 1986
Buku Referensi
Halliday, M.A.K., author
Oxford University Press, 1989
Buku Teks
Artikel Jurnal
Naerssen, Frits Herman van, author
The Royal Library, 1977
Buku Referensi
by A. Teeuw [and others]
Martinus Nijhoff, 1969
Buku Teks