Purvis,Martin, & Grainger,Alan. (2005). Exploring sustainable development: Geographical perspectives. Earthscan.
استشهاد بنمط شيكاغوPurvis,Martin, و Grainger,Alan. Exploring Sustainable Development: Geographical Perspectives. London: Earthscan, 2005.
MLA استشهادPurvis,Martin, و Grainger,Alan. Exploring Sustainable Development: Geographical Perspectives. Earthscan, 2005.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.