@book{6,
	author = {Ζαφειρόπουλος, Κώστας },
	title = {Πώς γίνεται μια επιστημονική εργασία :},
	publisher = {Κριτική,},
	year = {2015.},
	series = {Επιστημονική Βιβλιοθήκη  },
	address = {Αθήνα :},
	edition = {2η έκδ.}
}