Cita APA (7a ed.)
Abbs, B., & Freebairn, I. (1991). Opening Strategies. Teacher's Book: Strategies 1 (12.Impression.). Longman Group UK.
Cita Chicago Style (17a ed.)
Abbs, Brian, y Ingrid Freebairn. Opening Strategies. Teacher's Book: Strategies 1. 12.Impression. Harlow: Longman Group UK, 1991.
Cita MLA (9a ed.)
Abbs, Brian, y Ingrid Freebairn. Opening Strategies. Teacher's Book: Strategies 1. 12.Impression. Longman Group UK, 1991.
Precaución: Estas citas no son 100% exactas.