APA (7th ed.) Citation

Thoreau, H. D. (1977). The portable Thoreau. Penguin Books.

Chicago Style (17th ed.) Citation

Thoreau, Henry David. The Portable Thoreau. New York: Penguin Books, 1977.

MLA (8th ed.) Citation

Thoreau, Henry David. The Portable Thoreau. Penguin Books, 1977.

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