APA

John y Liz Soars, . (1993). Headway Teachers Book. Intermediate. New York: Osford University Press.

Chicago

John y Liz Soars, . 1993. Headway Teachers Book. Intermediate. New York: Osford University Press.

Harvard

John y Liz Soars, . (1993). Headway Teachers Book. Intermediate. New York: Osford University Press.

MLA

John y Liz Soars, . Headway Teachers Book. Intermediate. New York: Osford University Press. 1993.