The names and addresses of retailers selling the products of a manufacturer or wholesaler may be listed in an advertisement of that licensee if (a) the advertisement does not also contain the retail price of the product, and (b) the listing is the only reference to the retailer in the advertisement and is relatively inconspicuous in relation to the advertisement as a whole. Pictures or illustrations of retail establishments or laudatory references to retailers in manufacturer's or wholesaler's advertisements are not hereby authorized.