Masrin Gafar. “Implementation of the Policy on the Use of Corona Virus Disease 2019 Vaccine Cards As a Requirement for Aviation Administration at Sultan Bantilan Airport, Galang District, Tolitoli Regency”. Formosa Journal of Sustainable Research, vol. 1, no. 7, Dec. 2022, pp. 1115-34, doi:10.55927/fjsr.v1i7.2236.