Just a phrase I'm going through :my life in language

 Crystal, David,;

New York : : Routledge , 2009

Ensiklopedia bahasa = the cambridge encyclopedia of language

 Astuti, Rahmani; Crystal, David,;

Bandung : Nuansa Cendekia , 2015

The Cambridge Factfinder

 Crystal, David;

Cambridge : Cambridge University Press , 2001