APA استشهاد

Pushpam Kumar & Kumar, P. (2010). The economics of ecosystems and biodiversity: Ecological and economic foundations. Earthscan.

استشهاد بنمط شيكاغو

Pushpam Kumar و Pushpam Kumar. The Economics of Ecosystems and Biodiversity: Ecological and Economic Foundations. London ; Washington, DC: Earthscan, 2010.

MLA استشهاد

Pushpam Kumar و Pushpam Kumar. The Economics of Ecosystems and Biodiversity: Ecological and Economic Foundations. Earthscan, 2010.