APA ציטוט

Ley, W. (1969). Events in space. New York: David McKay Company.

Trích dẫn kiểu Chicago

Ley, Willy. Events in Space. New York: David McKay Company, 1969.

ציטוט MLA

Ley, Willy. Events in Space. New York: David McKay Company, 1969.