variable₁

Sources

• DOKE 1935 215

  DOKE, Clement M. (1935) Bantu Linguistic Terminology. London: Longmans, Green, & Co.

• NASH 1968 260

  NASH, Rose. (1968) Multilingual Lexicon of Linguistics and Philology: English, Russian, German, French. Coral Gables, FL: University of Miami Press. 

• GRIMES 1975 345 (variable frequency rule)

  GRIMES, Joseph E. (1975) The Thread of Discourse. The Hague: Mouton.

• MATTHEWS 1997 394 (also "variable feature")

  MATTHEWS, P.H. (1997) The Concise Oxford Dictionary of Linguistics. Oxford: Oxford University Press.

• CRYSTAL 2003 488

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