Cita APA (7a ed.)

Penrose, R. (2010). Cycles of time: An extraordinary new view of the universe. Bodley Head.

Cita Chicago Style (17a ed.)

Penrose, Roger. Cycles of Time: An Extraordinary New View of the Universe. London: Bodley Head, 2010.

Cita MLA (9a ed.)

Penrose, Roger. Cycles of Time: An Extraordinary New View of the Universe. Bodley Head, 2010.