Παραπομπή APA

Pushpam Kumar & Roldan Muradian. (2009). Payment for ecosystem services. Oxford University Press.

Παραπομπή Chicago Style

Pushpam Kumar και Roldan Muradian. Payment for Ecosystem Services. New Delhi: Oxford University Press, 2009.

Παραπομπή MLA

Pushpam Kumar και Roldan Muradian. Payment for Ecosystem Services. Oxford University Press, 2009.