Cita APA (7a ed.)

Abbot, C. G. (1955). Periodic solar variation. Smithsonian Institution.

Cita Chicago Style (17a ed.)

Abbot, Charles Greeley. Periodic Solar Variation. Washington, D. C: Smithsonian Institution, 1955.

Cita MLA (9a ed.)

Abbot, Charles Greeley. Periodic Solar Variation. Smithsonian Institution, 1955.