APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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