@book{66664,
	author = {Roberts, W.},
	title = {Printers' Marks: A Chapter in the History of Typography},
	publisher = {Project Gutenberg,},
	year = {2008},
	address = {Salt Lake City, UT :},
	note = {Release date is 2008-06-01},
	url = {https://www.gutenberg.org/ebooks/25663}
}