Leo Jones. (2002). New progress to proficiency (self-study student's book). Cambridge: Cambridge Univ. Press.
Čikaški stil citiranjaLeo Jones. New Progress to Proficiency (self-study Student's Book). Cambridge: Cambridge Univ. Press, 2002.
MLA način citiranjaLeo Jones. New Progress to Proficiency (self-study Student's Book). Cambridge: Cambridge Univ. Press, 2002.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.