Cita APA (7th ed.)

HarperCollins. (1991). Collins COBUILD English guides. 1, Prepositions. HarperCollins.

Cita Chicago (17th ed.)

HarperCollins. Collins COBUILD English Guides. 1, Prepositions. London: HarperCollins, 1991.

Cita MLA (8th ed.)

HarperCollins. Collins COBUILD English Guides. 1, Prepositions. HarperCollins, 1991.

Atenció: Aquestes cites poden no estar 100% correctes.