Παραπομπή APA

Ley, W. (1969). Rockets, Missiles an men in Space. New American Library.

Παραπομπή Chicago Style

Ley, Willy. Rockets, Missiles an Men in Space. New York: New American Library, 1969.

Παραπομπή MLA

Ley, Willy. Rockets, Missiles an Men in Space. New American Library, 1969.