APA (7th ed.) Citation

Grey, Z. (1998). Riders of the Purple Sage. Project Gutenberg.

Chicago Style (17th ed.) Citation

Grey, Zane. Riders of the Purple Sage. Project Gutenberg, 1998.

MLA (9th ed.) Citation

Grey, Zane. Riders of the Purple Sage. Project Gutenberg, 1998.

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