APA (7th ed.) Citation

Butcher, D. (1969). Exploring our national parks and monuments (6. ed., rev.). Houghton Mifflin.

Chicago Style (17th ed.) Citation

Butcher, Devereux. Exploring Our National Parks and Monuments. 6. ed., rev. Boston: Houghton Mifflin, 1969.

MLA (9th ed.) Citation

Butcher, Devereux. Exploring Our National Parks and Monuments. 6. ed., rev. Houghton Mifflin, 1969.