Hakka ( kejia )
Hakka ( kejia ) Wikipédia
A Hakka index to the Chinese-English dictionary of Herbert A. Giles, and to the Syllabic dictionary of Chinese of S. Wells Williams ... (1904) by MacIver, Donald. Archive.org
Les Langues dans le Monde Chinois (1987) by Coyaud, Maurice . Archive.org
he Languages of China (1987) by Ramsey, S. Robert . Archive.org
Hand book on the Haka Chin customs (1917) by Head, W. R . Archive.org