Section 20. Prior to the expiration of the 90-day period following the date of the enactment of this Act [Aug. 26, 1992], the Corporation for Public Broadcasting, in consultation with representatives of public broadcasting entities, shall develop guidelines to assure that program credits for public television programs that receive production funding directly from the Corporation for Public Broadcasting adequately disclose that all or a portion of the cost of producing such program was paid for by funding from the Corporation for Public Broadcasting, and that indicates in some manner that the Corporation for Public Broadcasting is partially funded from Federal tax revenues.