APA (7th ed.) Citation

Fenn, G. M., Hildibrand, H. T., & Riou, E. (2007). Off to the Wilds Being the Adventures of Two Brothers. Project Gutenberg.

Chicago Style (17th ed.) Citation

Fenn, George Manville, Henri Théophile Hildibrand, and Edouard Riou. Off to the Wilds Being the Adventures of Two Brothers. Project Gutenberg, 2007.

MLA (9th ed.) Citation

Fenn, George Manville, et al. Off to the Wilds Being the Adventures of Two Brothers. Project Gutenberg, 2007.

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