I am Liu Zinfat (Lau Chunfat/Liu Zhenfa), happy to see your questions. I am now printing my book on Hong Kong Hakka in Chinese and it will appear in a month's time. Name of the Book: 香港原居民客語 - 一個消失中的聲音(Hong Kong aboriginal Hakka, a vanishing voice). ca 250pages, A5 size, 10.5 point characters.
The book, in Traditional Chinese, tells everything about Hong Kong Aboriginal Hakka (Hiong Gong Ngen Gi Min Hak Ngi), including the grammar.
The book will be sold from July onwards in bookstores of Hong Kong, @ HK$50(US$7). However, I plan to send away 20 books as gifts for those who write to me from now onwards (each one of you is entitled to get ONE free book only), until the quota is filled. My mail: firstname.lastname@example.org
Please write your postal address in detail so that the book can reach you safely. From the 21st oder onwards, the book will be sold at its bookshop price, but you don't have to pay the postage. If you order five or ten books, you can get them with US$30 for 5 or $50 for 10.
Thanks for your support.
Dept of Chinese, Xiamen University, China