APA (7th ed.) Citation

Duffy, J. C., Jones, J. E., Clarey, C., Mácal, Z., & Duffy, J. (1994). Freedom works. Koss Classics.

Chicago Style (17th ed.) Citation

Duffy, John C., James Earl Jones, Cynthia Clarey, Zdeněk Mácal, and John Duffy. Freedom Works. Milwaukee, Wis.: Koss Classics, 1994.

MLA (9th ed.) Citation

Duffy, John C., et al. Freedom Works. Koss Classics, 1994.