Ian M. Hutchings. Leonardo da Vinci’s studies of friction(pdf). University of Cambridge, Department of Engineering, Institute for Manufacturing. April 18, 2016: 6 [May 18, 2021]. (原始内容存档(PDF)于2022-09-18). (PhD dissertation)
si.edu
si-pddr.si.edu
Frazier, Arthur H. Water Current Meters(PDF). Smithsonian Institution. [9 July 2012]. (原始内容存档(PDF)于2014-03-24).
Ian M. Hutchings. Leonardo da Vinci’s studies of friction(pdf). University of Cambridge, Department of Engineering, Institute for Manufacturing. April 18, 2016: 6 [May 18, 2021]. (原始内容存档(PDF)于2022-09-18). (PhD dissertation)