Greyson, James (2006). "An economic instrument for zero waste, economic growth and sustainability". Journal of Cleaner Production. 15 (2007): 1382–1390. doi:10.1016/j.jclepro.2006.07.019.
Gillian, Sheryl; Werner, Carol M.; Olson, Lynne; Adams, Dorothy (1996). "Teaching the concept of precycling: a campaign and evaluation". The Journal of Environmental Education. 28 (1): 11. Bibcode:1996JEnEd..28a..11G. doi:10.1080/00958964.1996.9942810.
Greyson, James (2006). "An economic instrument for zero waste, economic growth and sustainability". Journal of Cleaner Production. 15 (2007): 1382. doi:10.1016/j.jclepro.2006.07.019.
Gillian, Sheryl; Werner, Carol M.; Olson, Lynne; Adams, Dorothy (1996). "Teaching the concept of precycling: a campaign and evaluation". The Journal of Environmental Education. 28 (1): 12. Bibcode:1996JEnEd..28a..11G. doi:10.1080/00958964.1996.9942810.
Gillian, Sheryl; Werner, Carol M.; Olson, Lynne; Adams, Dorothy (1996). "Teaching the concept of precycling: a campaign and evaluation". The Journal of Environmental Education. 28 (1): 16. Bibcode:1996JEnEd..28a..11G. doi:10.1080/00958964.1996.9942810.
O'Leary, Philip R; Walsh, Patrick W (1999). "Source Reduction: Final Report"(PDF). Decision Maker's Guide to Solid Waste Management. 2: 5.
O'Leary, Philip R; Walsh, Patrick W (1999). "Source Reduction: Final Report"(PDF). Decision Maker's Guide to Solid Waste Management. 2: 6.
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Gillian, Sheryl; Werner, Carol M.; Olson, Lynne; Adams, Dorothy (1996). "Teaching the concept of precycling: a campaign and evaluation". The Journal of Environmental Education. 28 (1): 11. Bibcode:1996JEnEd..28a..11G. doi:10.1080/00958964.1996.9942810.
Gillian, Sheryl; Werner, Carol M.; Olson, Lynne; Adams, Dorothy (1996). "Teaching the concept of precycling: a campaign and evaluation". The Journal of Environmental Education. 28 (1): 12. Bibcode:1996JEnEd..28a..11G. doi:10.1080/00958964.1996.9942810.
Gillian, Sheryl; Werner, Carol M.; Olson, Lynne; Adams, Dorothy (1996). "Teaching the concept of precycling: a campaign and evaluation". The Journal of Environmental Education. 28 (1): 16. Bibcode:1996JEnEd..28a..11G. doi:10.1080/00958964.1996.9942810.