@book{73468,
	author = {Heck, Philipp},
	title = {Grundriss des Schuldrechts /},
	publisher = { J.C.B. Mohr (P. Siebeck),},
	year = {1929.},
	address = {Tübingen :},
	note = {Includes index.},
	url = {https://fll.law.cu.edu.eg/fulltext/bks/B10-11452.pdf}
}