Sison, O. D. V. (2004). Picture exchange communication system (PECS) among special children.
Chicago Style (17th ed.) CitationSison, Odette De Vera. Picture Exchange Communication System (PECS) Among Special Children. 2004.
MLA (9th ed.) CitationSison, Odette De Vera. Picture Exchange Communication System (PECS) Among Special Children. 2004.
Warning: These citations may not always be 100% accurate.