ISBN can identify a given title, its publisher, place of publication, and allow binding efficiently and accurately. In Hong Kong, theBooks Registration Office is responsible for all book registrations.
You may get the relevant forms online. If you register your publication with the Books Registration Office, you will need to submit 5 copies of each title under the Books Registration Ordinance. This is what you need to do if you publish a book for yourself. Also, you will need to go to the Books Registration Office in Lai Chi Kok for identification (of documents) and form submission. However, if you ask a publisher to publish your title, they will handle all the necessary procedure for you.