APA (7e ed.) Bronvermelding

Valcarcel, L. J. (2007). Ecological footprint. College of Business Administration, University of the Philippines.

Chicago (17e ed.) Bronvermelding

Valcarcel, Lina J. Ecological Footprint. Quezon City: College of Business Administration, University of the Philippines, 2007.

MLA (9e ed.) Bronvermelding

Valcarcel, Lina J. Ecological Footprint. College of Business Administration, University of the Philippines, 2007.