What are the available Hainanese (海南話) dictionaries? In particular, dictionaries of the Wenchang (文昌) dialect. If those are not available, dictionaries of the Haikou (海口) dialect are also fine.
If not mistaken, the government in Guangdong once published a series of dictionaries of the languages of Guangdong, including Cantonese, Hakka, and Hainanese. However, I don't remember the name of the series. (EDIT: I was mistaken. I was thinking about Guangdong Romanization (廣東拼音方案) for Cantonese, Hakka, Hainanese, and Teochew)