Orta, John, author
Garland Publishing, 1988
Buku Referensi
Artikel Jurnal
Kemp, Herman C., author
KITLV Press, 1990
Buku Referensi
Groenendael, Victoria M. Clara van, author
Foris Publications, 1987
Buku Referensi
Freedman, Ronald, author
Irvington, 1975
Buku Teks