APA (7th ed.) Citation

Ljung, L. (1988). System identification toolbox for use with MATLAB: User's guide. The Math Works.

Chicago Style (17th ed.) Citation

Ljung, Lennart. System Identification Toolbox for Use with MATLAB: User's Guide. Mass: The Math Works, 1988.

MLA (9th ed.) Citation

Ljung, Lennart. System Identification Toolbox for Use with MATLAB: User's Guide. The Math Works, 1988.