APA (7th ed.) Citation

Greever, G., & Bachelor, J. M. (2003). The Century Vocabulary Builder. Project Gutenberg.

Chicago Style (17th ed.) Citation

Greever, Garland, and Joseph M. Bachelor. The Century Vocabulary Builder. Project Gutenberg, 2003.

MLA (9th ed.) Citation

Greever, Garland, and Joseph M. Bachelor. The Century Vocabulary Builder. Project Gutenberg, 2003.

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