APA (7th ed.) Citation

Melbo, I. R. (1960). Our country's national parks (50 States ed.). Bobbs-Merrill.

Chicago Style (17th ed.) Citation

Melbo, Irving R. Our Country's National Parks. 50 States ed. Indianapolis: Bobbs-Merrill, 1960.

MLA (9th ed.) Citation

Melbo, Irving R. Our Country's National Parks. 50 States ed. Bobbs-Merrill, 1960.