APA

John y Liz Soars, . (1995). Headway workbook intermediate. New York: Osford University Press.

Chicago

John y Liz Soars, . 1995. Headway workbook intermediate. New York: Osford University Press.

Harvard

John y Liz Soars, . (1995). Headway workbook intermediate. New York: Osford University Press.

MLA

John y Liz Soars, . Headway workbook intermediate. New York: Osford University Press. 1995.