APA (7th ed.) Citation

Muir, J. (1991). Our national parks. Sierra Club Books.

Chicago Style (17th ed.) Citation

Muir, John. Our National Parks. San Francisco: Sierra Club Books, 1991.

MLA (9th ed.) Citation

Muir, John. Our National Parks. Sierra Club Books, 1991.

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