Bornok Situmorang, Noorlailie Soewarno. “A Study on Competitive Strategy and Vegetarian Restaurants’ Performance in Indonesia: Mediation and Psychological Impact of Loyalty of Customers”. Journal for ReAttach Therapy and Developmental Diversities, vol. 6, no. 6s, June 2023, pp. 609-22, https://jrtdd.com/index.php/journal/article/view/757.