Bell, G. (2004). The permaculture way: Practical steps to create a self-sustaining world. Chelsea Green Pub. Co..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBell, Graham. The Permaculture Way: Practical Steps to Create a Self-sustaining World. White River Junction, Vt.: Chelsea Green Pub. Co., 2004.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBell, Graham. The Permaculture Way: Practical Steps to Create a Self-sustaining World. Chelsea Green Pub. Co., 2004.
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