APA
International Congress of Applied Linguistics (2nd : 1969 : Cambridge E., Nickel G., British Association for Applied Linguistics & International Association of Applied Linguistics. (1971). Papers in contrastive linguistics. Cambridge [Eng.]: University Press.
Chicago
International Congress of Applied Linguistics (2nd : 1969 : Cambridge England), Nickel Gerhard, British Association for Applied Linguistics and International Association of Applied Linguistics. 1971. Papers in contrastive linguistics. Cambridge [Eng.]: University Press.
Harvard
International Congress of Applied Linguistics (2nd : 1969 : Cambridge E., Nickel G., British Association for Applied Linguistics and International Association of Applied Linguistics. (1971). Papers in contrastive linguistics. Cambridge [Eng.]: University Press.
MLA
International Congress of Applied Linguistics (2nd : 1969 : Cambridge England), Nickel Gerhard, British Association for Applied Linguistics and International Association of Applied Linguistics. Papers in contrastive linguistics. Cambridge [Eng.]: University Press. 1971.