Cita APA (7a ed.)

Alexander, L. G. (1983). First things first: : Students' book ; New concept english ; An Integrated Course for Beginners. Longman.

Cita Chicago Style (17a ed.)

Alexander, L. G. First Things First: : Students' Book ; New Concept English ; An Integrated Course for Beginners. Hong Kong: Longman, 1983.

Cita MLA (9a ed.)

Alexander, L. G. First Things First: : Students' Book ; New Concept English ; An Integrated Course for Beginners. Longman, 1983.