The Urdu writing system,
by William Bright and Saeed A. Khan.

APA Citation

Bright, W., Khan, S. A.. (1958). The Urdu writing system. New York: American Council of Learned Societies.

MLA Citation

Bright, William, 1928-2006, and Saeed A. Khan. The Urdu Writing System. New York: American Council of Learned Societies, 1958.

Warning: These citations may not always be complete (especially for serials).