Gaya APA

Selsam, M, E., Line, L. (1977). Land of the Giant tortoise : the story of the Galapagos . New York: Four Winds Press.

Gaya MLA

Selsam, Millicent, E.., Line, Les. "Land of the Giant tortoise : the story of the Galapagos". New York: Four Winds Press, 1977. Text.