Members of the legal profession would refer to tradition, precedent, and custom in a(n) law system.

Common

Explanation: Common law system is established on tradition, custom and precedence as they are unwritten and judicial decision on cases are determined by the outcome of the decision or verdict given on previous cases of similar stature or condition. Common laws digs into the past to reference previous cases and the country's legal history and also applying custom and tradition to specific circumstances. Judges opinion are backed by rulings passed on prior happenings or circumstances as the judges are empowered to modify judicial ruling.

because this was the year that the state of israel was formed