1. The citation of the 1974 case in which Chief Justice Warren Burger stated "However, neither the doctrine of separation of powers nor the need for confidentiality of high-level communications, without more, can sustain an absolute, unqualified Presidential privilege of immunity from judicial process under all circumstances."The challenge here is finding the citation from the official reporter.An internet search will probably turn up the case, but may only have the original version published by the court which will have a date and case number (called a slip opinion).

Looking for the citation from one of the three recognized reporters for that 1974 case