Beazley, M. (1991). Oceans. The World Conservation Union.
Cita Chicago (17th ed.)Beazley, Mitchell. Oceans. London: The World Conservation Union, 1991.
Cita MLA (9th ed.)Beazley, Mitchell. Oceans. The World Conservation Union, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.