APA (7th ed.) Citation

Oppenheim, E. P., & Avison, G. (2010). The Hillman. Project Gutenberg.

Chicago Style (17th ed.) Citation

Oppenheim, E. Phillips, and George Avison. The Hillman. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Oppenheim, E. Phillips, and George Avison. The Hillman. Project Gutenberg, 2010.

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