SHEIKH, Adnan Ahmed, et al. “THE EVOLUTION OF E-MARKETING IN BUSINESS-TO-BUSINESS (B2B) ENVIRONMENT AND ITS IMPACT ON FIRM PERFORMANCE”. Studia Universitatis Babeș-Bolyai Negotia, vol. 61, no. 4, Dec. 2016, pp. 33-48, https://studia.reviste.ubbcluj.ro/index.php/subbnegotia/article/view/5177.