Butterfield, H., author
Charles Scribner's Sons, 1950
Buku Teks
Robertson, John M., author
Watts & Co, 1931
Buku Teks
Jan Sinar Aritonang, Karel Steenbrink, editor
Brill, 2008
Buku Teks
Coleman, Janet, author
Blackwell Publishers, Ltd, 2000
Buku Teks
Brackman, Arnold C., author
Frederick A. Praeger , 1963
Buku Teks