Acklam, R. (1992). Help with Phrasal Verbs. Heinemann.
Cita Chicago Style (17a ed.)Acklam, Richard. Help with Phrasal Verbs. Heinemann, 1992.
Cita MLA (8a ed.)Acklam, Richard. Help with Phrasal Verbs. Heinemann, 1992.
Precaución: Estas citas no son 100% exactas.