@book{111576,
	author = {Ptolemy and Proclus,},
	title = {Ptolemy's Tetrabiblos},
	publisher = {Project Gutenberg,},
	year = {2023},
	address = {Salt Lake City, UT :},
	note = {Wikipedia page about this book: https://en.wikipedia.org/wiki/Tetrabiblos},
	url = {https://archive.org/details/ptolemystetrabib00ptol}
}