Machitidze, Irma, and Irina Bakhtadze. “Enriching PhD Education through Professor Assistantships and Research Collaborations-Insights from Columbia Teachers College and Drawing Parallels With PhD Programs in Georgian Universities”. European Scientific Journal, ESJ, vol. 40, Apr. 2025, p. 65, https://eujournal.org/index.php/esj/article/view/19346.