In the event two thirds or more of the farmers eligible for participation in such referendum and voting therein shall vote in favor of such assessment, then the said assessment shall be collected annually or at regular intervals during the year established by the rules and regulations of the duly certified commission, council, board or other agency for the number of years set forth in the call for such referendum, and the collection of such assessment shall be under such  method, rules and regulations as may be determined by the agency conducting the same; and the said assessment so collected shall be paid into the treasury of the agency conducting such referendum, to be used together with other funds from other sources, including donations from individuals, concerns or corporations, and grants from State or governmental agencies, for the purpose of promoting and stimulating, by advertising and other methods, the increased use and sale, domestic and foreign, of the agricultural commodity covered by such referendum. Such assessments may also be used for the purpose of financing or contributing toward the financing of a program of production, use and sale of any and all such agricultural commodities. (1947, c. 1018, s. 15; 1951, c. 1172, s. 3; 1965, c. 1046, s. 1; 1975, c. 708, s. 1.)