Cita APA (7a ed.)

Barrow, J. D. (1990). The world within the world. Oxford University Press.

Cita Chicago Style (17a ed.)

Barrow, John D. The World Within the World. Oxford [etc.]: Oxford University Press, 1990.

Cita MLA (9a ed.)

Barrow, John D. The World Within the World. Oxford University Press, 1990.