James, S., & Lahti, T. (2004). The natural step for communities: How cities and towns can change to sustainable practices. New Society Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रJames, Sarah, और Torbjörn Lahti. The Natural Step for Communities: How Cities and Towns Can Change to Sustainable Practices. Gabriola Island, B.C.: New Society Publishers, 2004.
एमएलए (8वां संस्करण) प्रशस्ति पत्रJames, Sarah, और Torbjörn Lahti. The Natural Step for Communities: How Cities and Towns Can Change to Sustainable Practices. New Society Publishers, 2004.
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