Cita APA (7th ed.)

Guarin, C. M. (1962). Playing with numbers. Phoenix Pub. House.

Cita Chicago (17th ed.)

Guarin, Ceferina M. Playing with Numbers. Quezon City: Phoenix Pub. House, 1962.

Cita MLA (9th ed.)

Guarin, Ceferina M. Playing with Numbers. Phoenix Pub. House, 1962.