Khan, B. (2012). Non-conventional energy resources (2nd.). TMH Education.
Chicago Style aipamenaKhan, B.H. Non-conventional Energy Resources. 2nd. New Delhi: TMH Education, 2012.
MLA aipamenaKhan, B.H. Non-conventional Energy Resources. 2nd. TMH Education, 2012.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.