Cita APA (7a ed.)

Gardner, M. (1986). Knotted doughnuts and other mathematical entertainments. W.H. Freeman.

Cita Chicago Style (17a ed.)

Gardner, Martin. Knotted Doughnuts and Other Mathematical Entertainments. New York: W.H. Freeman, 1986.

Cita MLA (9a ed.)

Gardner, Martin. Knotted Doughnuts and Other Mathematical Entertainments. W.H. Freeman, 1986.