Cita APA (7a ed.)
Forrester, A. (1988). Frontiers: <An> Intermediate Course in English. Practice Book (1. ed.). Collins Elt.
Cita Chicago Style (17a ed.)
Forrester, Anthony. Frontiers: <An> Intermediate Course in English. Practice Book. 1. ed. London: Collins Elt, 1988.
Cita MLA (9a ed.)
Forrester, Anthony. Frontiers: <An> Intermediate Course in English. Practice Book. 1. ed. Collins Elt, 1988.
Precaución: Estas citas no son 100% exactas.