APA
Clarke A. C., . (1976). Imperial earth. New York ; London: Harcourt Brace Janovich.
Chicago
Clarke Arthur C, . 1976. Imperial earth. New York ; London: Harcourt Brace Janovich.
Harvard
Clarke A. C., . (1976). Imperial earth. New York ; London: Harcourt Brace Janovich.
MLA
Clarke Arthur C, . Imperial earth. New York ; London: Harcourt Brace Janovich. 1976.
