Valcarcel, L. J. (2007). Ecological footprint. College of Business Administration, University of the Philippines.
Chicago (17e ed.) BronvermeldingValcarcel, Lina J. Ecological Footprint. Quezon City: College of Business Administration, University of the Philippines, 2007.
MLA (9e ed.) BronvermeldingValcarcel, Lina J. Ecological Footprint. College of Business Administration, University of the Philippines, 2007.
Let op: Deze citaties zijn niet altijd 100% accuraat.