APA (7th ed.) Citation

Hill, L. A., & Popkin, P. R. (1985). A first crossword puzzle book. Oxford University Press.

Chicago Style (17th ed.) Citation

Hill, L. A., and P. R. Popkin. A First Crossword Puzzle Book. Oxford: Oxford University Press, 1985.

MLA (9th ed.) Citation

Hill, L. A., and P. R. Popkin. A First Crossword Puzzle Book. Oxford University Press, 1985.