APA
Clarke A. C., . (1985). 2001. London: Octopus Books Ltd.
Chicago
Clarke Arthur C, . 1985. 2001. London: Octopus Books Ltd.
Harvard
Clarke A. C., . (1985). 2001. London: Octopus Books Ltd.
MLA
Clarke Arthur C, . 2001. London: Octopus Books Ltd. 1985.