Cita APA (7a ed.)

(1956). Periods related to 273 months or 22-3/4 years. Smithsonian Institution.

Cita Chicago Style (17a ed.)

Periods Related to 273 Months or 22-3/4 Years. Washington, D. C: Smithsonian Institution, 1956.

Cita MLA (9a ed.)

Periods Related to 273 Months or 22-3/4 Years. Smithsonian Institution, 1956.