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2.Literature Review Introduction (Ondina & Cristian, 2016) …

- - - - (Akila, Vasantha, & Thirumagal, 2020)
    - - (Ciesielkiewicz, Bonilla, & López de Ayala, 2020).
      - (Singh & Narang, 2008)
      - Guo, Alamudun, & Hammond, 2016)
- - - - (Young & Foot, 2005).