B. E. HAJIKULOV. HOW TO KEEP LOYAL RELATIONSHIPS WITH SERVICE CUSTOMERS USING HOLISTIC MARKETING. International Journal of Innovations in Engineering Research and Technology, Maharashatra, India, v. 7, n. 09, p. 3–8, 2021. Disponível em: https://repo.ijiert.org/index.php/ijiert/article/view/125. Acesso em: 1 aug. 2025.