Cita APA (7a ed.)

Barrow, J. D. (1992). Pi in the sky: Counting, thinking, and being (1st paperback ed.). Little, Brown.

Cita Chicago Style (17a ed.)

Barrow, John D. Pi in the Sky: Counting, Thinking, and Being. 1st paperback ed. Boston [etc.]: Little, Brown, 1992.

Cita MLA (9a ed.)

Barrow, John D. Pi in the Sky: Counting, Thinking, and Being. 1st paperback ed. Little, Brown, 1992.