Cita APA (7a ed.)
Abbs, B., & Freebairn, I. (1990). Developing strategies. Strategies 3.: Students' Book (1.vyd.23.dotlač.). Longman Group UK.
Cita Chicago Style (17a ed.)
Abbs, Brian, y Ingrid Freebairn. Developing Strategies. Strategies 3.: Students' Book. 1.vyd.23.dotlač. Harlow: Longman Group UK, 1990.
Cita MLA (9a ed.)
Abbs, Brian, y Ingrid Freebairn. Developing Strategies. Strategies 3.: Students' Book. 1.vyd.23.dotlač. Longman Group UK, 1990.
Precaución: Estas citas no son 100% exactas.