Gardner, R. (2011). Recycle: Green science projects for a sustainable planet. Enslow Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGardner, Robert. Recycle: Green Science Projects for a Sustainable Planet. Berkeley Heights, NJ: Enslow Publishers, 2011.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGardner, Robert. Recycle: Green Science Projects for a Sustainable Planet. Enslow Publishers, 2011.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.