APA (7. basım) Alıntı

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

Chicago Style (17. basım) Atıf

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

MLA (9th ed.) Atıf

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