O'Leary, T. et al. (2019). Computing Essentials 2019 (27^e éd.). McGraw-Hill.

""Background” software that enables the application software to interact with the computer. System software consists of the operating system, utilities, device drivers, and language translators. It works with application software to handle the majority of technical details." (O'Leary et al., 2019, p. 375)