Gaya APA

Bernthal, J, E. et al (2009). Articulation and Phonological Disorders : Speech Sound Disorders in Children 6'th Ed. (6). Boston: Pearson Education.

Gaya MLA

Bernthal, John, E.. et al. "Articulation and Phonological Disorders : Speech Sound Disorders in Children 6'th Ed.". 6 Boston: Pearson Education, 2009. Text.