1. British North Borneo Herald. (1913, February 17).
2. Borneo Today. (2020, June 20). Native tongues in decline but all is not lost. https://www.borneotoday.net/native-tongues-in-decline-but-all-is-not-lost/#:~:text=An%20indigenous%20study%20expert%20says,people%20sit%20on%20their%20laurels.
3. Brown, G. K. (2007). Making ethnic citizens: The politics and practice of education in Malaysia. International Journal of Educational Development, 27, 318–330. https://doi.org/10.1016/j.ijedudev.2006.12.002.
4. Carvalho, M., Tang, A., & Zainal, F. (2022, March 24). Ismail Sabri to use Bahasa Malaysia for official speeches, says Foreign Minister. The Star. https://www.thestar.com.my/news/nation/2022/03/24/ismail-sabri-to-use-bahasa-malaysia-for-official-speeches-internationally-says-foreign-minister.
5. Crain, J. B. (1970). The Megalong Lun Dayeh Long-House. Sarawak Museum Journal, 18, 169–185.