APA (7th ed.) Citation

Vandenburg, G. L. (2010). The Observers. Project Gutenberg.

Chicago Style (17th ed.) Citation

Vandenburg, G. L. The Observers. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Vandenburg, G. L. The Observers. Project Gutenberg, 2010.

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