APA   Click to copy
Crawford, W., & Caprario, M. English as a lingua franca: Practice and research. Wiley.

Chicago/Turabian   Click to copy
Crawford, W., and M. Caprario. English as a Lingua Franca: Practice and Research. Wiley, n.d.

MLA   Click to copy
Crawford, W., and M. Caprario. English as a Lingua Franca: Practice and Research. Wiley.

@book{crawford-a,
  title = {English as a lingua franca: Practice and research},
  publisher = {Wiley},
  author = {Crawford, W. and Caprario, M.}
}