Gaya APA

Helvarg, D. (2005). The Ocean and coastal conservation guide : the blue movement directory 2005-2006 / editor: David Helvarg . Washinto: Island Press.

Gaya MLA

Helvarg, David.. "The Ocean and coastal conservation guide : the blue movement directory 2005-2006 / editor: David Helvarg". Washinto: Island Press, 2005. Buku.