Johnston, O. (2006). New Opportunities; education for life: Elementary language powerbook. Longman.
Cita Chicago (17th ed.)Johnston, Olivia. New Opportunities; Education for Life: Elementary Language Powerbook. England: Longman, 2006.
Cita MLA (9th ed.)Johnston, Olivia. New Opportunities; Education for Life: Elementary Language Powerbook. Longman, 2006.
Atenció: Aquestes cites poden no estar 100% correctes.