1. Leeb D. New dynamic method for hardness testing of metallic materials. — In: VDI-Report № 308, 1978, pp. 123–128., Leeb D. New dynamic method for hardness testing of metallic materials. — In: VDI-Report № 308, 1978, pp. 123–128.
2. DIN 50156-1:2007 / Metallic materials — Leeb hardness test — Part 1: Test Method., DIN 50156-1:2007 / Metallic materials — Leeb hardness test — Part 1: Test Method.
3. DIN 50156-2:2007 / Metallic materials — Leeb hardness test — Part 2: Verification and calibration of the testing devices., DIN 50156-2:2007 / Metallic materials — Leeb hardness test — Part 2: Verification and calibration of the testing devices.
4. DIN 50156-3:2007 / Metallic materials — Leeb hardness test — Part 3: Calibration of reference blocks., DIN 50156-3:2007 / Metallic materials — Leeb hardness test — Part 3: Calibration of reference blocks.
5. ASTM A956 / Standard Test Method for Leeb Hardness Testing of Steel Products. 2012., ASTM A956 / Standard Test Method for Leeb Hardness Testing of Steel Products. 2012.