Bonds issued under the provisions of this act shall not be deemed to constitute, within the meaning of any constitutional or statutory limitation, an indebtedness of the county authority. Such bonds shall be payable solely from the revenues or assets of the county authority pledged therefor. Each bond issued under this act shall contain on the face thereof a statement to the effect that such county authority shall not be obligated to pay the same nor the interest thereon except from the revenues or assets pledged therefor.