Sison, O. D. V. (2004). Picture exchange communication system (PECS) among special children.
Citazione stile Chigago Style (17a edizione)Sison, Odette De Vera. Picture Exchange Communication System (PECS) Among Special Children. 2004.
Citatione MLA (9a ed.)Sison, Odette De Vera. Picture Exchange Communication System (PECS) Among Special Children. 2004.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.