Cita APA

Crook, W. J., & Crook, W. J. (1958). Abacus arithmetic: How to perform some calculations on the chinese abacus. Palo Alto, Calif.: Pacific Books.

Citación estilo Chicago

Crook, Welton J., y Welton J. Crook. Abacus Arithmetic: How to Perform Some Calculations On the Chinese Abacus. Palo Alto, Calif.: Pacific Books, 1958.

Cita MLA

Crook, Welton J., y Welton J. Crook. Abacus Arithmetic: How to Perform Some Calculations On the Chinese Abacus. Palo Alto, Calif.: Pacific Books, 1958.