Cita APA (7a ed.)

Hill, L. A., Popkin, P. R., & Wrigley, D. (1968). A first crossword puzzle book. Oxford University Press.

Cita Chicago Style (17a ed.)

Hill, L. A., P. R. Popkin, y Denis Wrigley. A First Crossword Puzzle Book. London: Oxford University Press, 1968.

Cita MLA (9a ed.)

Hill, L. A., et al. A First Crossword Puzzle Book. Oxford University Press, 1968.