category₁

Sources

• CRYSTAL 2003 66 (category variable), 478 (category shifting)

  CRYSTAL, David. (2003) A Dictionary of Linguistics and Phonetics, 5th Ed Oxford: Blackwell.

• RICHARDS etal. 1992 48 (category system)

  RICHARDS, Jack, PLATT, J. & WEBER, H. (1992) Longman Dictionary of Language Teaching & Applied Linguistics. London: Longman.

• FINCH 2000 81 (category-variable)

  FINCH, Geoffrey. (2000) Linguistic Terms and Concepts. New York: St. Martin's Press.