Juščius, Vytautas, Valentinas Navickas, and Donatas Jonikas. “Relationship Marketing: Theorethical Aspects”. Business: Theory and Practice 7, no. 4 (December 27, 2006): 254-262. Accessed December 23, 2024. https://jcem.vgtu.lt/index.php/BTP/article/view/11603.