by ASHRAF UMRAN, CERTO NICK, HARRIS W. PORTER, THIBAULT ROBERT WESLEY
Year of Publication 25.11.2020

by ASHRAF, Umran, HARRIS, W. Porter, THIBAULT, Robert Wesley, CERTO, Nick
Year of Publication 04.05.2022

by Ashraf, Umran, Certo, Nick, Harris, W. Porter, Thibault, Robert Wesley, Dubey, Prahit, Galvan, Karlo
Year of Publication 09.03.2023

by Ashraf, Umran, Certo, Nick, Harris, W. Porter, Thibault, Robert Wesley, Dubey, Prahit, Galvan, Karlo
Year of Publication 17.01.2023

by ASHRAF, Umran, HARRIS, W. Porter, THIBAULT, Robert Wesley, CERTO, Nick
Year of Publication 20.01.2021

by ASHRAF, Umran, HARRIS, W. Porter, THIBAULT, Robert Wesley, CERTO, Nick
Year of Publication 19.09.2019

by Mautz, Denise, Storey, Keith, Certo, Nick
Published in Journal of the Association for Persons with Severe Handicaps (01.12.2001)

by Ashraf, Umran, Certo, Nick, Harris, W. Porter, Thibault, Robert Wesley, Dubey, Prahit, Galvan, Karlo
Year of Publication 19.09.2019

by ASHRAF UMRAN, CERTO NICK, HARRIS W. PORTER, THIBAULT ROBERT WESLEY
Year of Publication 30.10.2020

by Sontag, Ed, Certo, Nick, Button, James E.
Published in Exceptional children (01.09.1981)

by Sontag, Ed, Certo, Nick, Button, James E
Published in Exceptional children (01.09.1981)

by Sontag, Ed, Certo, Nick, Button, James E
Published in Exceptional children (01.01.1978)

by Williams, Wes, Brown, Lou, Certo, Nick
Published in Theory into practice (01.04.1975)

by Certo, Nick
Published in Education and training of the mentally retarded (01.06.1985)

by NICK CERTO MT. LEBANON
Published in Pittsburgh post-gazette (Pittsburgh, Pa. 1978) (02.01.2000)

by Sontag, Ed, Certo, Nick, Button, James E.
Published in Exceptional children (01.05.1979)

by Schleien, Stuart J
Published in Education and training of the mentally retarded (01.01.1984)