^Hammarström, Harald; Forkel, Robert; Haspelmath, Martin; Bank, Sebastian (编). Cuoi. Glottolog 2.7. Jena: Max Planck Institute for the Science of Human History. 2016.
Ferlus, Michel. Hypercorrections in the Thổ dialect of Làng Lỡ (Nghệ An, Vietnam): an example of pitfalls for comparative linguistics. 2015 (英语).
Nguyen, Huu Hoanh and Nguyen Van Loi (2019). Tones in the Cuoi Language of Tan Ki District in Nghe An Province, Vietnam [1]. The Journal of the Southeast Asian Linguistics Society 12.1:lvii-lxvi.