Korolev.

New York: Wiley, 1997.

Hartt, Julian.

The Mighty Thor.

New York: Duell, Sloan and Pearce, 1961.

Heppenheimer, T.A.

Toward Distant Suns.

Harrisburg, Pa.: Stackpole, 1979. ---.

Turbulent Skies: The History of Commercial Aviation.

New York: Wiley, 1995. ---.

अज्ञात पृष्ठ