SOETIRTO, Soetirto. PENGARUH PRODUCT INVOLVEMENT TERHADAP BRAND LOYALTY GROCERY PADA SUPERMARKET DI SURABAYA MELALUI PRICE PERCEPTION. CALYPTRA, [S.l.], v. 6, n. 2, p. Hal. 1241 – 1265, sep. 2017. ISSN 2302-8203. Available at: <http://journal.ubaya.ac.id/index.php/jimus/article/view/1057>. Date accessed: 18 sep. 2019.