Safaei Movahed, Saeed, nouri, firouz, Bafandeh, Hamideh, Nouri, Frouz, Safaee Movahed, Saeid. “Calculating the Training Return on Investment (ROI) In Pars Oil & Gas Company (P.O.G.C).” Quarterly Journal of Training and Development of Human Resources, vol. 7, no. 24, 2020, pp. 107-127. 10.52547/istd.7.24.0