Cita APA (7th ed.)

Environmental Center of the Phil. Foundation, Inc. (1991). Manual for the preparation of an area ecological profile. s.n.

Cita Chicago (17th ed.)

Environmental Center of the Phil. Foundation, Inc. Manual for the Preparation of an Area Ecological Profile. s.l: s.n, 1991.

Cita MLA (9th ed.)

Environmental Center of the Phil. Foundation, Inc. Manual for the Preparation of an Area Ecological Profile. s.n, 1991.