APA
Els T. v., Bongaerts Theo jt author & Extra Guus j. a. (1993). Applied linguistics and the learning and teaching of foreign languages. London: Edwrd Arnold.
Chicago
Els Theo van, Bongaerts Theo jt author and Extra Guus jt author. 1993. Applied linguistics and the learning and teaching of foreign languages. London: Edwrd Arnold.
Harvard
Els T. v., Bongaerts Theo jt author and Extra Guus j. a. (1993). Applied linguistics and the learning and teaching of foreign languages. London: Edwrd Arnold.
MLA
Els Theo van, Bongaerts Theo jt author and Extra Guus jt author. Applied linguistics and the learning and teaching of foreign languages. London: Edwrd Arnold. 1993.