APA (7th ed.) Citation

Kirkwood, D. (2012). Comets and Meteors Their phenomena in all ages; their mutual relations; and the theory of their origin. Project Gutenberg.

Chicago Style (17th ed.) Citation

Kirkwood, Daniel. Comets and Meteors Their Phenomena in All Ages; Their Mutual Relations; and the Theory of Their Origin. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Kirkwood, Daniel. Comets and Meteors Their Phenomena in All Ages; Their Mutual Relations; and the Theory of Their Origin. Project Gutenberg, 2012.

Warning: These citations may not always be 100% accurate.