APA (7th ed.) Citation

Abbs, B., Abbs, B., Freebairn, I., & Freebairn, I. (1990). Blueprint one. Longman group.

Chicago Style (17th ed.) Citation

Abbs, Brian, Brian Abbs, Ingrid Freebairn, and Ingrid Freebairn. Blueprint One. Harlow: Longman group, 1990.

MLA (9th ed.) Citation

Abbs, Brian, et al. Blueprint One. Longman group, 1990.