APA (7th ed.) Citation

Sánchez, G. I. (1961). Arithmetic in Maya. [publisher not identified].

Chicago Style (17th ed.) Citation

Sánchez, George Isidore. Arithmetic in Maya. [Austin? Tex.]: [publisher not identified], 1961.

MLA (8th ed.) Citation

Sánchez, George Isidore. Arithmetic in Maya. [publisher not identified], 1961.