APA (7th ed.) Citation

Gummere, F. B. (1959). The popular ballad. Dover Pub.

Chicago Style (17th ed.) Citation

Gummere, Francis Barton. The Popular Ballad. New York: Dover Pub, 1959.

MLA (9th ed.) Citation

Gummere, Francis Barton. The Popular Ballad. Dover Pub, 1959.