National Geographic Society (Washington, D.C.), WQED (Television station : Pittsburg, Pa.), & Seamans, J. (1991). Great lakes, fragile seas [videorecording]. The Society.
Chicago Style (17th ed.) CitationNational Geographic Society (Washington, D.C.), Pa.) WQED (Television station : Pittsburg, and Joe Seamans. Great Lakes, Fragile Seas [videorecording]. Washington, D.C: The Society, 1991.
MLA (8th ed.) CitationNational Geographic Society (Washington, D.C.), et al. Great Lakes, Fragile Seas [videorecording]. The Society, 1991.
Warning: These citations may not always be 100% accurate.