@book{50160,
	author = {ਸੋਬਤੀ, ਸਰੋਜ},
	title = {ਵਾਤਾਵਰਣ ਸਿੱਖਿਆ},
	publisher = {Twenty First Century Publications},
	year = {2009},
	address = {Patiala}
}