There is hereby incorporated by reference for the purpose of establishing employee fringe benefits the document entitled “City of Enterprise Personnel Rules and Regulations.” No fewer than three copies of said document shall be marked or stamped “Official Copy as Incorporated by the Code of the City of Enterprise.” Official copies shall be filed with the city clerk and shall be open to inspection and available to the public at all reasonable hours of business. All departments of the city shall be supplied with copies of such fringe benefits as may be necessary.