Jones, L. (2003). New progress to proficiency: Self-study Student's book. Đà Nẵng: Nxb Đà Nẵng.
Παραπομπή Chicago StyleJones, Leo. New Progress to Proficiency: Self-study Student's Book. Đà Nẵng: Nxb Đà Nẵng, 2003.
Παραπομπή MLAJones, Leo. New Progress to Proficiency: Self-study Student's Book. Đà Nẵng: Nxb Đà Nẵng, 2003.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.