O'Hara, K., Iudicello, S., & Zilligen, J. (1994). A citizen's guide to plastics in the ocean: More than a litter problem (4th ed.). Center for Marine Conservation.
Chicago Style (17th ed.) CitationO'Hara, Kathryn, Suzanne Iudicello, and Jil Zilligen. A Citizen's Guide to Plastics in the Ocean: More than a Litter Problem. 4th ed. Washington, DC: Center for Marine Conservation, 1994.
MLA (9th ed.) CitationO'Hara, Kathryn, et al. A Citizen's Guide to Plastics in the Ocean: More than a Litter Problem. 4th ed. Center for Marine Conservation, 1994.
Warning: These citations may not always be 100% accurate.