Cita APA (7a ed.)

Hill, L. A., Popkin, P. R., & Kaplin, I. (1969). A second crossword puzzle book. Oxford University Press.

Cita Chicago Style (17a ed.)

Hill, L. A., P. R. Popkin, y Ivor Kaplin. A Second Crossword Puzzle Book. London: Oxford University Press, 1969.

Cita MLA (9a ed.)

Hill, L. A., et al. A Second Crossword Puzzle Book. Oxford University Press, 1969.