Earle, S. A. (2014). Blue hope: Exploring and caring for earth's magnificent ocean. National Geographic.
Citazione stile Chigago Style (17a edizione)Earle, Sylvia A. Blue Hope: Exploring and Caring for Earth's Magnificent Ocean. Washington, D.C: National Geographic, 2014.
Citatione MLA (9a ed.)Earle, Sylvia A. Blue Hope: Exploring and Caring for Earth's Magnificent Ocean. National Geographic, 2014.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.