@Book{BVMC:243107, author = {Pacioli, Luca}, title = {Su[m]ma de Arithmetica Geometria Proportioni [et] Proportionalità}, publisher = {Alicante : Biblioteca Virtual Miguel de Cervantes, 2003}, year = {2003}, url = {https://www.cervantesvirtual.com/nd/ark:/59851/bmc8g8k5} }