Παραπομπή APA

Kahan,Steven. (1978). Have some sums to solve: The complete alphametics books. Universities press.

Παραπομπή Chicago Style

Kahan,Steven. Have Some Sums to Solve: The Complete Alphametics Books. Hyderabad: Universities press, 1978.

Παραπομπή MLA

Kahan,Steven. Have Some Sums to Solve: The Complete Alphametics Books. Universities press, 1978.