@book{76456,
	author = {Pickering, Edward C.},
	title = {A Plan for Securing Observations of the Variable Stars},
	publisher = {Project Gutenberg,},
	year = {2011},
	address = {Salt Lake City, UT :},
	note = {Release date is 2011-03-19},
	url = {https://www.gutenberg.org/ebooks/35613}
}