Any notices required or permitted to be given under this Agreement shall be sufficient if in writing, and if personally delivered or when sent by first class certified or registered mail, postage prepaid, return receipt requested; in the case of the Executive, to his residence address as set forth in the books and records of the Company, and in the case of the Company, to the address of its principal place of business, to such person or at such other address with respect to each party as such party shall notify the other in writing.