@book{48485,
	author = {Aleksander Mratinkovic, Dan Piestun, Hazem Shawky Fouda Felecia Killings Dr.Sandra El Hajj Fozia Parveen, Igor Krunic, Dr. Tanjaina Nur, Stephen Obtained, Michelle.},
	title = {Free open  source  software},
	publisher = {Cengage learning},
	year = {2018},
	address = {New York},
	edition = {c.1 }
}