APA (7th ed.) Citation

Watt,John. (1987). Applied fourth generation languages. Sigma Press.

Chicago Style (17th ed.) Citation

Watt,John. Applied Fourth Generation Languages. Wilmslow,England: Sigma Press, 1987.

MLA (9th ed.) Citation

Watt,John. Applied Fourth Generation Languages. Sigma Press, 1987.

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