APA aipamena

(2012). Water and air quality directory 2012. Kerala Pollution Control Board.

Chicago Style aipamena

Water and Air Quality Directory 2012. Kerala Pollution Control Board, 2012.

MLA aipamena

Water and Air Quality Directory 2012. Kerala Pollution Control Board, 2012.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.