Cita APA (7a ed.)

Butler, C. P. (1911). The Spectrum of Halley's Comet. Harrison and sons, printers.

Cita Chicago Style (17a ed.)

Butler, Charles P. The Spectrum of Halley's Comet. [London: Harrison and sons, printers, 1911.

Cita MLA (9a ed.)

Butler, Charles P. The Spectrum of Halley's Comet. Harrison and sons, printers, 1911.