APA (7th ed.) Citation

Berrios, I. (1993). A user-friendly computer simulation of a spark ignition engine. [publisher not identified].

Chicago Style (17th ed.) Citation

Berrios, Ivan. A User-friendly Computer Simulation of a Spark Ignition Engine. [Place of publication not identified]: [publisher not identified], 1993.

MLA (9th ed.) Citation

Berrios, Ivan. A User-friendly Computer Simulation of a Spark Ignition Engine. [publisher not identified], 1993.