APA (7th ed.) Citation

HeppenheimerlhT.A. Countdown: A history of space flight.

Chicago Style (17th ed.) Citation

HeppenheimerlhT.A. Countdown: A History of Space Flight. New YorklbJohn wiley & sons, inclc1997.

MLA (9th ed.) Citation

HeppenheimerlhT.A. Countdown: A History of Space Flight.

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