Coba jelasin Catatan dari George D. Zamka dong

This article incorporates text in the public domain from the National Aeronautics and Space Administration, a United States government agency.

Astronaut Bio: George D. Zamka , NASA, June 2006. Retrieved on 2006-06-25.

NASA Appoints Crew for Space Station Mission, UPI, 2006-06-20. Retrieved on 2006-06-25.

Spacefacts biography of George D. Zamka