Cita APA (7a ed.)

Smithsonian Institution. (1902). List of observatories. Smithsonian Institution.

Cita Chicago Style (17a ed.)

Smithsonian Institution. List of Observatories. Washington: Smithsonian Institution, 1902.

Cita MLA (9a ed.)

Smithsonian Institution. List of Observatories. Smithsonian Institution, 1902.