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3. Perlmutter DM (2011) What is sign language? Linguistic Soc America 1325:20036–26501
4. RA 11106—An Act Declaring the Filipino Sign Language as The National Sign Language of The Filipino Deaf And The Official Sign Language Of Government In All Transactions Involving The Deaf, And Mandating Its Use In Schools, Broadcast Media, And Workplaces https://www.ncda.gov.ph/disability-laws/republic-acts/ra-11106/
5. Mendoza A (2018) The sign language is unique to Deaf Filipinos. https://cnnphilippines.com/life/culture/2018/10/29/Filipino-Sign-Language.html