1. Attap roofing is made from woven palm leaves from the attap palm (nipah ruticans).
2. ‘Chinese names of streets and places in Singapore and the Malay Peninsula’.Journal of the Straits Branch of the Royal Asiatic Society (JSBRAS), 42 H W Firmstone, (1905): 68.Lau Kha-Khu-Keng-Khauis Hokkien, whileKau Ka-Ku ha'is a Cantonese adaptation of the Hokkien term.
3. “Hindustani, Tamil, Sanskrit and other loan words in Malay”.Journal of the Straits Branch of the Royal Asiatic Society, 80 A W Hamilton,29–38, May 1919, p32, 33, 36.