Cita APA (7a ed.)

Page, T. (1967). Observatories of the world. Smithsonian Institution. Astrophysical Observatory.

Cita Chicago Style (17a ed.)

Page, Thornton. Observatories of the World. Cambridge: Smithsonian Institution. Astrophysical Observatory, 1967.

Cita MLA (9a ed.)

Page, Thornton. Observatories of the World. Smithsonian Institution. Astrophysical Observatory, 1967.