Cita APA (7a ed.)

Davies, P. C. W. (1990). Other worlds. Penguin Books.

Cita Chicago Style (17a ed.)

Davies, P. C. W. Other Worlds. London [etc.]: Penguin Books, 1990.

Cita MLA (9a ed.)

Davies, P. C. W. Other Worlds. Penguin Books, 1990.