Full text of the Constitutional and the Basic Law can be downloaded from the Hong Kong Government's official webpage. https://www.basiclaw.gov.hk/en/index/index.html
Chapter VI Education, Science, Culture, Sports, Religion, Labour and Social Services
The following subject headings may help you find books and other materials related to Basic Law in iSearch:
Central-local government relations -- China -- Hong Kong
Constitutional law -- China -- Hong Kong
Constitutional law -- Study and teaching (Elementary) -- China -- Hong Kong
The Basic Law of the Hong Kong Special Administrative Region by 
The Basic Law of the Hong Kong Special Administrative Region of the People's Republic of China
Introduction to the Hong Kong Basic Law by 
The Judicial Construction of Hong Kong's Basic Law by 中華人民共和國憲法 : 中華人民共和國香港特別行政區基本法及相關法律文件