MLA

Thoreau, Henry David, et al. Reflections At Walden. [Kansas City, Mo.: Hallmark, 1971.

APA

Thoreau, H. David, Emerson, R. Waldo, Morgan, J., & Seymour, P. (1971). Reflections at Walden. [Kansas City, Mo.: Hallmark.

Chicago

Thoreau, Henry David, and Ralph Waldo Emerson. Reflections At Walden. Edited by James Morgan and Peter Seymour. [Kansas City, Mo.: Hallmark, 1971.