Cita APA (7a ed.)

Laverty, C. e. a. (1971). The unity of english. Five basic focal points. Harper and Row.

Cita Chicago Style (17a ed.)

Laverty, Carroll et al. The Unity of English. Five Basic Focal Points. New York, Estados Unidos: Harper and Row, 1971.

Cita MLA (9a ed.)

Laverty, Carroll et al. The Unity of English. Five Basic Focal Points. Harper and Row, 1971.