Cita APA (7a ed.)
Simak, C. D. City / Ring Around the Sun / First He Died. Ace Books : Dell.
Cita estilo Chicago (17a ed.)
Simak, Clifford D. City / Ring Around the Sun / First He Died. Nueva York, EUA: Ace Books : Dell.
Cita MLA (9a ed.)
Simak, Clifford D. City / Ring Around the Sun / First He Died. Ace Books : Dell.
Precaución: Estas citas no son 100% exactas.