1. A.Y. Aikhenvald, The Art of Grammar: A Practical Guide (Oxford University Press, Oxford, 2014), p. 99
2. G.T. Childs, African ideophones, in Sound Symbolism, p. 179
3. E.V. Gelderen, Sample entry: function words. Encyclopedia of Linguistics (n.d.). http://strazny.com/encyclopedia/sample-functionwords.html
4. A. Carnie, Syntax: A Generative Introduction (Wiley-Blackwell, New Jersey, 2012), pp. 51–52
5. TDIL, MeiTy, GOI. Technology Development for Indian Languages Programme, Govt. of India. https://tdil.meity.gov.in