@book{74509,
	author = {Planck, Max, and Clarke, Hans Thacher,},
	title = {The Origin and Development of the Quantum Theory},
	publisher = {Project Gutenberg,},
	year = {2010},
	address = {Salt Lake City, UT :},
	note = {Release date is 2010-09-07},
	url = {https://archive.org/details/origindevelopmen00planrich/page/n1/mode/2up}
}