Cita APA (7a ed.)
Alexander, L. (1967). New concept english: First things first students book. Longman.
Cita Chicago Style (17a ed.)
Alexander, L.G. New Concept English: First Things First Students Book. London: Longman, 1967.
Cita MLA (9a ed.)
Alexander, L.G. New Concept English: First Things First Students Book. Longman, 1967.
Precaución: Estas citas no son 100% exactas.