APA (7th ed.) Citation

Crossley, J. N., Ash, C. J., Brickhill, C. J., & Williams, N. H. (1990). What is mathematical logic? Dover Publications.

Chicago Style (17th ed.) Citation

Crossley, John N., C. J. Ash, C. J. Brickhill, and N. H. Williams. What Is Mathematical Logic? New York, N.Y: Dover Publications, 1990.

MLA (8th ed.) Citation

Crossley, John N., et al. What Is Mathematical Logic? Dover Publications, 1990.