APA   Click to copy
Caprario, M. Teaching the passive voice. In J. C. Richards (Ed.), Key Issues in Language Teaching. Cambridge University Press.

Chicago/Turabian   Click to copy
Caprario, M. “Teaching the Passive Voice.” In Key Issues in Language Teaching, edited by J. C. Richards. Cambridge University Press, n.d.

MLA   Click to copy
Caprario, M. “Teaching the Passive Voice.” Key Issues in Language Teaching, edited by J. C. Richards, Cambridge University Press.

@inbook{m-a,
  title = {Teaching the passive voice},
  publisher = {Cambridge University Press},
  author = {Caprario, M.},
  editor = {Richards, J. C.},
  booktitle = {Key Issues in Language Teaching}
}