APA (7th ed.) Citation

O'Neil, P. (1977). The frontiersmen. Time-Life Books.

Chicago Style (17th ed.) Citation

O'Neil, Paul. The Frontiersmen. Alexandria, Va: Time-Life Books, 1977.

MLA (9th ed.) Citation

O'Neil, Paul. The Frontiersmen. Time-Life Books, 1977.

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