From how many sources does this constitution, on which the Constitution of Alberta is modeled, draws?
Constitution of Alberta:  Alberta's constitution, like Britain's (on which it is modeled), includes any and all pieces of legislation, court decisions, proclamations, and conventions which together inform how the province operates. Constitution of the United Kingdom:  The British constitution primarily draws from four sources: statute law (laws passed by the legislature), common law (laws established through court judgments), parliamentary conventions, and works of authority.
four sources