APA (7th ed.) Citation

Proctor, R. A. (2007). Half-Hours with the Stars A Plain and Easy Guide to the Knowledge of the Constellations. Project Gutenberg.

Chicago Style (17th ed.) Citation

Proctor, Richard A. Half-Hours with the Stars A Plain and Easy Guide to the Knowledge of the Constellations. Project Gutenberg, 2007.

MLA (9th ed.) Citation

Proctor, Richard A. Half-Hours with the Stars A Plain and Easy Guide to the Knowledge of the Constellations. Project Gutenberg, 2007.

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