1. British Library MSS Eur.F.148/4
2. Leiden University Library Klinkert 138
3. Amoroso, Donna. 2014. Traditionalism and the ascendancy of the Malay ruling class in colonial Malaya. Singapore: NUS Press.
4. Ancestors and rituals. 2017. Catalogue. Brussels: Europalia Arts Festival and Snoeck.
5. Andaya, Barbara Watson. 1979. Perak: the abode of grace. Kuala Lumpur: Oxford University Press, 1979.