APA (7th ed.) Citation

Abbs, B., & Freebairn, I. (1992). Discoveries. Students' Book 1. Longman.

Chicago Style (17th ed.) Citation

Abbs, Brian, and Ingrid Freebairn. Discoveries. Students' Book 1. Essex: Longman, 1992.

MLA (9th ed.) Citation

Abbs, Brian, and Ingrid Freebairn. Discoveries. Students' Book 1. Longman, 1992.