Ritchie, G., & Ariffin, Y. (1982). Sonographic analysis of speech sounds with varying positions of the upper anterior teeth. Elsevier.
Chicago Style (17th ed.) CitationRitchie, G.M, and Y.T Ariffin. Sonographic Analysis of Speech Sounds with Varying Positions of the Upper Anterior Teeth. Elsevier, 1982.
MLA (9th ed.) CitationRitchie, G.M, and Y.T Ariffin. Sonographic Analysis of Speech Sounds with Varying Positions of the Upper Anterior Teeth. Elsevier, 1982.
Warning: These citations may not always be 100% accurate.