APA
Null R., . (2017). Universal design : principles and models. Boca Raton: CRC Press.
Chicago
Null Roberta, . 2017. Universal design : principles and models. Boca Raton: CRC Press.
Harvard
Null R., . (2017). Universal design : principles and models. Boca Raton: CRC Press.
MLA
Null Roberta, . Universal design : principles and models. Boca Raton: CRC Press. 2017.