Cita APA (7a ed.)

Empson, W. (1990). Seven types of ambiguity (3ra. ed.). New Directions.

Cita Chicago Style (17a ed.)

Empson, William. Seven Types of Ambiguity. 3ra. ed. New York: New Directions, 1990.

Cita MLA (8a ed.)

Empson, William. Seven Types of Ambiguity. 3ra. ed. New Directions, 1990.