APA

Mehrotra P., Trivedi G., Kumar R., World Petroleum Congress (15th. : 1997 : Beijing), Trivedi G. & Kumar R.Increase in risk and cost for pollution control in petroleum industries in 21st century and need for technology upgradation. : .

Chicago

Mehrotra P.N, Trivedi G.K, Kumar Rajiv, World Petroleum Congress (15th. : 1997 : Beijing), Trivedi G.K and Kumar Rajiv.Increase in risk and cost for pollution control in petroleum industries in 21st century and need for technology upgradation. : .

Harvard

Mehrotra P., Trivedi G., Kumar R., World Petroleum Congress (15th. : 1997 : Beijing), Trivedi G. and Kumar R.Increase in risk and cost for pollution control in petroleum industries in 21st century and need for technology upgradation. : .

MLA

Mehrotra P.N, Trivedi G.K, Kumar Rajiv, World Petroleum Congress (15th. : 1997 : Beijing), Trivedi G.K and Kumar Rajiv.: . .