Cita APA (7th ed.)

Gasgonia, D. Z. (2021). Environmental law and policies (2021 edition.). University of the Philippines Law Center.

Cita Chicago (17th ed.)

Gasgonia, Donna Zapa. Environmental Law and Policies. 2021 edition. Quezon City: University of the Philippines Law Center, 2021.

Cita MLA (9th ed.)

Gasgonia, Donna Zapa. Environmental Law and Policies. 2021 edition. University of the Philippines Law Center, 2021.