Shepard, F. P. (1964). The earth beneath the sea. Atheneum.
Cita Chicago (17th ed.)Shepard, Francis Parker. The Earth Beneath the Sea. Nueva York: Atheneum, 1964.
Cita MLA (9th ed.)Shepard, Francis Parker. The Earth Beneath the Sea. Atheneum, 1964.
Atenció: Aquestes cites poden no estar 100% correctes.