APA (7th ed.) Citation

Heintz, K., & Rafferty, J. P. (2013). Hot-air ballooning from the Montgolfier brothers to the present. Encyclopedia Britannica.

Chicago Style (17th ed.) Citation

Heintz, Kurt, and John P. Rafferty. Hot-air Ballooning from the Montgolfier Brothers to the Present. Chicago, IL: Encyclopedia Britannica, 2013.

MLA (9th ed.) Citation

Heintz, Kurt, and John P. Rafferty. Hot-air Ballooning from the Montgolfier Brothers to the Present. Encyclopedia Britannica, 2013.