APA (7th ed.) Citation

Emerson, E. Comet Lore: Halley's Comet in History and Astronomy.

Chicago Style (17th ed.) Citation

Emerson, Edwin. Comet Lore: Halley's Comet in History and Astronomy.

MLA (9th ed.) Citation

Emerson, Edwin. Comet Lore: Halley's Comet in History and Astronomy.

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