Handriana, T., and W. R. Wisandiko. “Consumer Attitudes Toward Advertisement and Brand, Based on the Number of Endorsers and Product Involvement: An Experimental Study”. Gadjah Mada International Journal of Business, Vol. 19, no. 3, Dec. 2017, pp. 289-06, https://dev.journal.ugm.ac.id/v3/gamaijb/article/view/15598.