Cita APA (7a ed.)

Langley, S. P., & Very, F. W. (1901). On the cheapest form of light. Smithsonian Institution.

Cita Chicago Style (17a ed.)

Langley, S. P., y Frank W. Very. On the Cheapest Form of Light. Washington: Smithsonian Institution, 1901.

Cita MLA (9a ed.)

Langley, S. P., y Frank W. Very. On the Cheapest Form of Light. Smithsonian Institution, 1901.