Rockwell hardness test (English Wikipedia)

Pavlina, E.J.; Van Tyne, C.J. (December 2008). "Correlation of Yield Strength and Tensile Strength with Hardness for Steels". Journal of Materials Engineering and Performance. 17 (6): 888–893. Bibcode:2008JMEP...17..888P. doi:10.1007/s11665-008-9225-5.

cutleryscience.com (Global: low place; English: low place)

"Knife blade materials". 31 May 2008. Archived from the original on 2008-05-31. Retrieved 18 February 2022.

Pavlina, E.J.; Van Tyne, C.J. (December 2008). "Correlation of Yield Strength and Tensile Strength with Hardness for Steels". Journal of Materials Engineering and Performance. 17 (6): 888–893. Bibcode:2008JMEP...17..888P. doi:10.1007/s11665-008-9225-5.
Sundararajan, G.; Roy, M. (2001). "Hardness Testing". Encyclopedia of Materials: Science and Technology. pp. 3728–3736. doi:10.1016/B0-08-043152-6/00665-3. ISBN 978-0-08-043152-9.
Broitman, Esteban (2017). "Indentation Hardness Measurements at Macro-, Micro-, and Nanoscale: A Critical Overview". Tribology Letters. 65 (23): 4–5. doi:10.1007/s11249-016-0805-5.

CONNECTICUT STATE REGISTER OF HISTORIC PLACES REGISTRATION FORM – For Stanley P. Rockwell Company Factory, 5/6/2016. https://hartfordpreservation.org/wp-content/uploads/296-Homestead-Stanley-Rockwell-Factory-State-Register-Nomination.pdf. Retrieved 5/24/2023

OpenCorporates, "STANLEY P. ROCKWELL COMPANY THE". https://opencorporates.com/companies/us_ct/0090160. Retrieved 5/24/2023

H.M. Rockwell & S.P. Rockwell, "Hardness-Tester," U.S. patent 1,294,171, Feb 1919.
S. P. Rockwell, "Hardness-Testing Machine", U.S. patent 1,516,207, Nov 1924.

Hardness Tester, JM (17 April 2019). "Rockwell Hardness Testing: The Ultimate Guide". JM Hardness Tester. Retrieved 21 September 2021.

Fundamentals of Rockwell Hardness Testing, archived from the original on 2010-01-29, retrieved 2010-09-10
PMPA's Designer's Guide: Heat treatment, archived from the original on 2009-07-14, retrieved 2009-06-19.
"Knife blade materials". 31 May 2008. Archived from the original on 2008-05-31. Retrieved 18 February 2022.