Dudley, R. H. (1953). Sea shells. Thomas Y. Crowell.
Cita Chicago (17th ed.)Dudley, Ruth H. Sea Shells. Nueva York: Thomas Y. Crowell, 1953.
Cita MLA (9th ed.)Dudley, Ruth H. Sea Shells. Thomas Y. Crowell, 1953.
Atenció: Aquestes cites poden no estar 100% correctes.