Before adopting the master plan or any part of it or any substantial amendment thereof, the planning commission shall hold at least one public hearing thereon. Notice of the time of such hearing shall be given by one publication in the official municipal newspaper. The adoption of the plan, or of a part thereof or amendment thereto, shall be by a resolution of the commission carried by the affirmative votes of not less than two-thirds of the members thereof. The resolution shall refer expressly to the maps and descriptive matter intended by the commission to form the whole or part of the plan or amendment. The action taken by the commission shall be recorded on the map, plan, and descriptive matter by the identifying signature of the secretary of the commission. An attested copy of the master plan shall be certified to the governing body of the municipality.