The history of the abacus

MLA

Pullan, J. M. The History of the Abacus. New York: Praeger, 1969.

APA

Pullan, J. M. (1969). The history of the abacus. New York: Praeger.

Chicago

Pullan, J. M. The History of the Abacus. New York: Praeger, 1969.