Source: https://www.researchgate.net/profile/Zouheir-Maalej/publication/260369426_Persuasion_and_counter-persuasion_of_visual_metaphor_in_consumer_advertising/links/0f317530f0a9c503b2000000/Persuasion-and-counter-persuasion-of-visual-metaphor-in-consumer-advertising.pdf