APA (7e ed.) Bronvermelding

Abbs, B. (1996). Blueprint one: Students' Book (18a. ed.). Longman.

Chicago (17e ed.) Bronvermelding

Abbs, Brian. Blueprint One: Students' Book. 18a. ed. Essex: Longman, 1996.

MLA (9e ed.) Bronvermelding

Abbs, Brian. Blueprint One: Students' Book. 18a. ed. Longman, 1996.