@book{19823,
	author = {Pressman, Roger S. and Maxim, Burce R.},
	title = {Software engineering : a practitioner's approach},
	publisher = {Mc graw hill},
	year = {2020, 2019, 2021},
	address = {Chennai},
	edition = {8th ed.},
	note = {Acc No 37431-37440 year 2021}
}