Cita APA (7th ed.)

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.