Cita APA (7a ed.)

Isaacs, D. A. (1973). English our language (7º) (2ª.). Casals, S.A.

Cita Chicago Style (17a ed.)

Isaacs, David. Autor. English Our Language (7º). 2ª. Barcelona: Casals, S.A, 1973.

Cita MLA (9a ed.)

Isaacs, David. Autor. English Our Language (7º). 2ª. Casals, S.A, 1973.