Danelius, Hans
The Swedish Institute, 1981
Buku Teks
Foster, Steve, author
Oxford university press, 2012
Buku Teks
edited by Kenneth W. Thompson
University Press of America, 1980
Buku Teks
The John Hopkins University Press, 1976
Buku Teks
S.M. Haider
The Book House, 1978
Buku Teks