APA-viite (7. p.)
North, B. (2000). The development of a common framework scale of language proficiency. Peter Lang.
Chicago-viite (17. p.)
North, Brian. The Development of a Common Framework Scale of Language Proficiency. New York: Peter Lang, 2000.
MLA-viite (9. p.)
North, Brian. The Development of a Common Framework Scale of Language Proficiency. Peter Lang, 2000.
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