APA (7th ed.) Citation

IBM. (1990). Informix-4GL vol. 1: User Guide. Informix Software.

Chicago Style (17th ed.) Citation

IBM. Informix-4GL Vol. 1: User Guide. Informix Software, 1990.

MLA (8th ed.) Citation

IBM. Informix-4GL Vol. 1: User Guide. Informix Software, 1990.

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