APA (7th ed.) Citation

Holden, F. B., & Orban, P. (2010). A Gift For Terra. Project Gutenberg.

Chicago Style (17th ed.) Citation

Holden, Fox B., and Paul Orban. A Gift For Terra. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Holden, Fox B., and Paul Orban. A Gift For Terra. Project Gutenberg, 2010.

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