Citazione Stile APA (7a Edizione)

Abbs, B., & Freebairn, I. (1985). Opening Strategies. Students' book. Strategies 1. Longman.

Citazione stile Chigago Style (17a edizione)

Abbs, Brian, e Ingrid Freebairn. Opening Strategies. Students' Book. Strategies 1. Essex: Longman, 1985.

Citatione MLA (9a ed.)

Abbs, Brian, e Ingrid Freebairn. Opening Strategies. Students' Book. Strategies 1. Longman, 1985.