Sawhney,g.s. (2012). Non-conventional energy resources. PHI learning pvt.
Citazione stile Chigago Style (17a edizione)Sawhney,g.s. Non-conventional Energy Resources. Delhi: PHI learning pvt, 2012.
Citatione MLA (9a ed.)Sawhney,g.s. Non-conventional Energy Resources. PHI learning pvt, 2012.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.