Gaya APA

Paul, R., Norbury, C, F. (2012). Language disorders from infancy through adolescence 4th ed (4th edition). United States of America: Mosby elsevier.

Gaya MLA

Paul, Rhea., Norbury, Courtenay, F. "Language disorders from infancy through adolescence 4th ed". 4th edition United States of America: Mosby elsevier, 2012. Text.