Cita APA (7th ed.)

Shaw, B. (1971). Back to Methuselah. Penguin Books.

Cita Chicago (17th ed.)

Shaw, Bernard. Back to Methuselah. Gran Bretaña: Penguin Books, 1971.

Cita MLA (9th ed.)

Shaw, Bernard. Back to Methuselah. Penguin Books, 1971.