Empson, W. (1995). Seven types of ambiguity. Penguin Books in association with Chatto and Windus.
Citazione stile Chigago Style (17a edizione)Empson, William. Seven Types of Ambiguity. Harmondsworth, Middlesex: Penguin Books in association with Chatto and Windus, 1995.
Citatione MLA (8a ed.)Empson, William. Seven Types of Ambiguity. Penguin Books in association with Chatto and Windus, 1995.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.