@book{107144,
	author = {Mantere, Oskari, and Sarva, Gunnar,},
	title = {Keskikoulun Yleinen Historia. 1. Vanha ja Keskiaika :},
	publisher = {Project Gutenberg,},
	year = {2021},
	address = {Salt Lake City, UT :},
	note = {Release date is 2021-09-17},
	url = {https://www.gutenberg.org/ebooks/66322}
}