APA (7th ed.) Citation

Gray, P. M. D., & Lucas, R. (1988). PROLOG and databases: Implementations and new directions. E. Horwood ; Halsted Press.

Chicago Style (17th ed.) Citation

Gray, Peter M. D., and Robert Lucas. PROLOG and Databases: Implementations and New Directions. Chichester : New York: E. Horwood ; Halsted Press, 1988.

MLA (9th ed.) Citation

Gray, Peter M. D., and Robert Lucas. PROLOG and Databases: Implementations and New Directions. E. Horwood ; Halsted Press, 1988.