APA (7th ed.) Citation

Popper, M., & Kelly, R. V. Practical knowledge engineering: Creating commercial expert systems.

Chicago Style (17th ed.) Citation

Popper, Mikuláš, and R. V. Kelly. Practical Knowledge Engineering: Creating Commercial Expert Systems.

MLA (9th ed.) Citation

Popper, Mikuláš, and R. V. Kelly. Practical Knowledge Engineering: Creating Commercial Expert Systems.

Warning: These citations may not always be 100% accurate.