Cita APA (7a ed.)

Hill, L. A., Galsworthy, G. J., & Popkin, P. R. (1971). A fourth crossword puzzle book. Oxford University Press.

Cita Chicago Style (17a ed.)

Hill, L. A., Gay John Galsworthy, y P. R. Popkin. A Fourth Crossword Puzzle Book. London: Oxford University Press, 1971.

Cita MLA (9a ed.)

Hill, L. A., et al. A Fourth Crossword Puzzle Book. Oxford University Press, 1971.