APA

National Geographic Society U.S, . (1991). Canada's incredible coasts / c prepared by the Book Division, National Geographic Society, Washington, D.C. Washington, D.C: National Geographic Society.

Chicago

National Geographic Society U.S, . 1991. Canada's incredible coasts / c prepared by the Book Division, National Geographic Society, Washington, D.C. Washington, D.C: National Geographic Society.

Harvard

National Geographic Society U.S, . (1991). Canada's incredible coasts / c prepared by the Book Division, National Geographic Society, Washington, D.C. Washington, D.C: National Geographic Society.

MLA

National Geographic Society U.S, . Canada's incredible coasts / c prepared by the Book Division, National Geographic Society, Washington, D.C. Washington, D.C: National Geographic Society. 1991.