APA (7th ed.) Citation

Peary, R. E., Grosvenor, G. H., & Roosevelt, T. (2006). The North Pole Its Discovery in 1909 under the auspices of the Peary Arctic Club. Project Gutenberg.

Chicago Style (17th ed.) Citation

Peary, Robert E., Gilbert Hovey Grosvenor, and Theodore Roosevelt. The North Pole Its Discovery in 1909 Under the Auspices of the Peary Arctic Club. Project Gutenberg, 2006.

MLA (9th ed.) Citation

Peary, Robert E., et al. The North Pole Its Discovery in 1909 Under the Auspices of the Peary Arctic Club. Project Gutenberg, 2006.

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