APA (7th ed.) Citation

Hill, L. A., Popkin, P. R., & Kaplin, I. (1970). A third crossword puzzle book. Oxford University Press.

Chicago Style (17th ed.) Citation

Hill, L. A., P. R. Popkin, and Ivor Kaplin. A Third Crossword Puzzle Book. London: Oxford University Press, 1970.

MLA (9th ed.) Citation

Hill, L. A., et al. A Third Crossword Puzzle Book. Oxford University Press, 1970.