sahraeian,R and hosseini,S H . (2013). Risk Management in Exploiting Spot Market in Spite of Purchase Discount. Iranian Journal of Trade Studies, 17(66), 49-72.

sahraeian,R , and hosseini,S H . "Risk Management in Exploiting Spot Market in Spite of Purchase Discount", Iranian Journal of Trade Studies, 17, 66, 2013, 49-72.

sahraeian R, hosseini S H. (2013). 'Risk Management in Exploiting Spot Market in Spite of Purchase Discount', Iranian Journal of Trade Studies, 17(66), pp. 49-72.

R sahraeian and S H hosseini, "Risk Management in Exploiting Spot Market in Spite of Purchase Discount," Iranian Journal of Trade Studies, 17 66 (2013): 49-72,

sahraeian R, hosseini S H. Risk Management in Exploiting Spot Market in Spite of Purchase Discount. Iranian Journal of Trade Studies. 2013;17(66):49-72 (In Persian).