1. Adams, K. L. (1989). Systems of Numeral Classification in the Mon-Khmer, Nicobarese and Aslian Subfamilies of Austroasiatic. Canberra: Pacific Linguistics.
2. Aikhenvald, A.Y. (2000). Classifiers: A Typology of Noun Categorization Devices. Oxford: Oxford University Press.
3. Allan, Keith (1977). Classifiers. Language, Vol. 53, No. 2, pp. 285-311.
4. Cao, X. H. (2004). Tiếng Việt – Sơ thảo ngữ pháp chức năng (The Vietnamese Language – A Rough Draft on Functional Grammar), Hanoi: Publishing House of Social Sciences.
5. Celce-Murcia, M., & Larsen-Freeman, D. (1998). The Grammar Book: An ESL/EFL Teacher’s Course, Second Edition (2nd ed.). Heinle ELT.