O'Brien, K., & Longden, F. (2003). English for adults: Activity book: A three-book series taking false beginners to First Certificate level. Grivas Publications.
Παραπομπή σε μορφή Chicago (17η εκδ.)O'Brien, Kathleen, και Fiona Longden. English for Adults: Activity Book: A Three-book Series Taking False Beginners to First Certificate Level. [Aspropyrgos]: Grivas Publications, 2003.
Παραπομπή σε μορφή MLA (8th εκδ.)O'Brien, Kathleen, και Fiona Longden. English for Adults: Activity Book: A Three-book Series Taking False Beginners to First Certificate Level. Grivas Publications, 2003.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.
