APA
(1972). The Fascinating secrets of Oceans & Islands. Great Britain: The Reader's Digest Association Limited.
Chicago
1972. The Fascinating secrets of Oceans & Islands. Great Britain: The Reader's Digest Association Limited.
Harvard
(1972). The Fascinating secrets of Oceans & Islands. Great Britain: The Reader's Digest Association Limited.
MLA
The Fascinating secrets of Oceans & Islands. Great Britain: The Reader's Digest Association Limited. 1972.