APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

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

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