@book{69405,
	author = {Park, Robert Ezra, and Burgess, E. W.},
	title = {Introduction to the Science of Sociology},
	publisher = {Project Gutenberg,},
	year = {2009},
	address = {Salt Lake City, UT :},
	note = {Release date is 2009-04-04},
	url = {https://www.gutenberg.org/ebooks/28496}
}