Cita APA (7a ed.)

Becker, R. A. (1985). Extending the S system. Wadsworth Advanced Books and Software.

Cita Chicago Style (17a ed.)

Becker, R. A. Extending the S System. Monterey, California: Wadsworth Advanced Books and Software, 1985.

Cita MLA (9a ed.)

Becker, R. A. Extending the S System. Wadsworth Advanced Books and Software, 1985.