APA (7th ed.) Citation

Frith, H., & Kingston, W. H. G. (2007). Notable Voyagers From Columbus to Nordenskiold. Project Gutenberg.

Chicago Style (17th ed.) Citation

Frith, Henry, and William Henry Giles Kingston. Notable Voyagers From Columbus to Nordenskiold. Project Gutenberg, 2007.

MLA (9th ed.) Citation

Frith, Henry, and William Henry Giles Kingston. Notable Voyagers From Columbus to Nordenskiold. Project Gutenberg, 2007.

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