Dyfyniad APA

Research & Practice for Persons with Severe Disabilities.

Dyfyniad Arddull Chicago

Research & Practice for Persons with Severe Disabilities.

Dyfyniad MLA

Research & Practice for Persons with Severe Disabilities.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.