Cita APA (7th ed.)
North, B. (2000). The development of a common framework scale of language proficiency. Peter Lang.
Cita Chicago (17th ed.)
North, Brian. The Development of a Common Framework Scale of Language Proficiency. New York: Peter Lang, 2000.
Cita MLA (9th ed.)
North, Brian. The Development of a Common Framework Scale of Language Proficiency. Peter Lang, 2000.
Atenció: Aquestes cites poden no estar 100% correctes.