Cita APA (7a ed.)
Abbs, B., & Freebairn, I. (1982). Opening Strategies 1: <An> Integrated Language Course for Beginners of English (1. ed.). Longman.
Cita Chicago Style (17a ed.)
Abbs, Brian, y Ingrid Freebairn. Opening Strategies 1: <An> Integrated Language Course for Beginners of English. 1. ed. Harlow: Longman, 1982.
Cita MLA (9a ed.)
Abbs, Brian, y Ingrid Freebairn. Opening Strategies 1: <An> Integrated Language Course for Beginners of English. 1. ed. Longman, 1982.
Precaución: Estas citas no son 100% exactas.