APA (7th ed.) Citation

Sy, D. A. (1970). Butuan through the ages. [s.n.

Chicago Style (17th ed.) Citation

Sy, Dionisio A. Butuan Through the Ages. Cebu City: [s.n, 1970.

MLA (9th ed.) Citation

Sy, Dionisio A. Butuan Through the Ages. [s.n, 1970.