Cita APA (7a ed.)

Hale, G. E., & Ellerman, F. (1905). The Rumford spectroheliograph of the Yerkes Observatory. Government printing office.

Cita Chicago Style (17a ed.)

Hale, George Ellery, y Ferdinand Ellerman. The Rumford Spectroheliograph of the Yerkes Observatory. Washington: Government printing office, 1905.

Cita MLA (9a ed.)

Hale, George Ellery, y Ferdinand Ellerman. The Rumford Spectroheliograph of the Yerkes Observatory. Government printing office, 1905.