APA (7th ed.) Citation

Bolc, L. (1980). Natural language question answering systems. Hanser ; Macmillan.

Chicago Style (17th ed.) Citation

Bolc, Leonard. Natural Language Question Answering Systems. Munchen [i.e. Munich] [etc.] : London [etc.]: Hanser ; Macmillan, 1980.

MLA (8th ed.) Citation

Bolc, Leonard. Natural Language Question Answering Systems. Hanser ; Macmillan, 1980.