Swettenham, Frank Athelstane (1910). "ball". Vocabulary of the English and Malay languages. Shanghai & Hong Kong: Kelly & Walsh, limited. m/s. 7 – melalui Internet Archive.
Wilkinson, Richard James (1901). "raga". A Malay-English dictionary. Hong Kong: Kelly & Walsh, limited. m/s. 316. Rencana ini mengandungi teks dari sumber yang berada dalam domain awam.
books.google.com
"Code of Federal Regulations: 1985-1999". U.S. General Services Administration, National Archives and Records Service, Office of the Federal Register. 5 November 1999. Diarkibkan daripada yang asal pada 7 November 2017. Dicapai pada 5 November 2017 – melalui Google Books.
dbp.gov.my
prpm.dbp.gov.my
"raga". Kamus Dewan (ed. ke-4). Dewan Bahasa dan Pustaka Malaysia. 2017.
"Code of Federal Regulations: 1985-1999". U.S. General Services Administration, National Archives and Records Service, Office of the Federal Register. 5 November 1999. Diarkibkan daripada yang asal pada 7 November 2017. Dicapai pada 5 November 2017 – melalui Google Books.