Cita APA (7th ed.)
Jackson, R. T. (1922). Fossil Echini of the West Indies.
Cita Chicago (17th ed.)
Jackson, Robert Tracy. Fossil Echini of the West Indies. Washington, 1922.
Cita MLA (9th ed.)
Jackson, Robert Tracy. Fossil Echini of the West Indies. 1922.
Atenció: Aquestes cites poden no estar 100% correctes.