Cita APA

Villanueva, R., & Dulce, L. (2012). Langis at kalikasan. DZUP.

Citación estilo Chicago

Villanueva, Raymund, and Leon Dulce. Langis at Kalikasan. Quezon City: DZUP, 2012.

Cita MLA

Villanueva, Raymund, and Leon Dulce. Langis at Kalikasan. DZUP, 2012.

Warning: These citations may not always be 100% accurate.