[1] BUDYNAS, R. G. a NISBETT, J. K.: Shigley's mechanical engineering design. 8th ed. in SI Units. McGraw-Hill series in mechanical engineering. New York: McGraw-Hill, c2008. ISBN 978-007-125763-3.
[2] GREEN, Paul. Geometrical Tolerancing Desk Reference - Creating and Interpreting ISO Standard Technical Drawings. Elsevier. ISBN 978-0-7506-6821-7 .