Cita APA (7a ed.)

Becker, G. F., & Clarke, F. W. (1880). The constants of nature. Smithsonian Institution.

Cita Chicago Style (17a ed.)

Becker, George F., y Frank Wigglesworth Clarke. The Constants of Nature. Washington: Smithsonian Institution, 1880.

Cita MLA (8a ed.)

Becker, George F., y Frank Wigglesworth Clarke. The Constants of Nature. Smithsonian Institution, 1880.