Cita APA (7a ed.)
Abbs, B., & Freebairn, I. (1990). Opening strategies.Strategies 1.: An integrated language course for beginners of english.Students' Book (1.vyd.22.dotlač.). Longman Group UK.
Cita Chicago Style (17a ed.)
Abbs, Brian, y Ingrid Freebairn. Opening Strategies.Strategies 1.: An Integrated Language Course for Beginners of English.Students' Book. 1.vyd.22.dotlač. Harlow: Longman Group UK, 1990.
Cita MLA (9a ed.)
Abbs, Brian, y Ingrid Freebairn. Opening Strategies.Strategies 1.: An Integrated Language Course for Beginners of English.Students' Book. 1.vyd.22.dotlač. Longman Group UK, 1990.
Precaución: Estas citas no son 100% exactas.