1. Lysaght, V.E., Indentation Hardness Testing, Reinhold Publishing Corp., New York, 1949, pp. 57-105.

2. ASTM E 18 – 2000, Standard Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials, West Conshohocken, PA, ASTM, 2000.

3. ISO 6508-1 Metallic Materials – Rockwell hardness test (scales A, B, C, D, E, F, G, H, K, N, T) – Part 1: Test method, Geneva, International Organization for Standardization, 1999.

4. ISO 6508-2 Metallic Materials – Rockwell hardness test (scales A, B, C, D, E, F, G, H, K, N, T) – Part 2: Verification of testing machines, Geneva, International Organization for Standardization, 1999.

5. ISO 6508-3 Metallic Materials – Rockwell hardness test (scales A, B, C, D, E, F, G, H, K, N, T) – Part 3: Calibration of reference blocks, Geneva, International Organization for Standardization, 1999.

6. OIML International Recommendation No. 12 (1974), Verification and calibration of “Rockwell C" hardness standardized blocks.

7. OIML International Recommendation No. 36 (1976), Verification of indenters for hardness testing machines (Systems: Brinell – Rockwell B, F, and T – Vickers – Rockwell C, A, and N).

8. OIML International Recommendation No. 39 (1981), Verification of hardness testing machines (Rockwell B, F, T – C, A, N systems).

9. OIML International Recommendation No. 11 (1974), Verification and calibration of “Rockwell B" hardness standardized blocks.

10. Liggett, W.S., Low, S.R., Pitchure, D.J., and Song, J., “Capability in Rockwell C Scale Hardness," Journal of Research of the National Institute of Standards and Technology, Volume 105, Number 4, July–August 2000, pp. 511–533.

11. Metals Handbook, 8thEdition, Vol. 11, Nondestructive Inspection and Quality Control, H.E. Boyer, editor, American Society for Metals, pp. 1–13.

12. Metals Handbook, Ninth Edition, Vol. 8, Mechanical Testing, Rockwell Hardness Testing, A.R. Fee, R. Segabache, E.L. Tobolski, American Society for Metals, pp. 74–83.

13. Metals Handbook, Desk Edition, H.E. Boyer and T.L. Gall, editors, American Society for Metals, Hardness Testing, pp. 34–4 to 34–8, 1985.

14. Low, S.R., Pitchure, D.J., Flanigan, C.D., “The Effect of Suggested Changes to the Rockwell Hardness Test Method," Proceedings of XVI IMEKO World Congress, eds. Osanna, P., Durakbasa, A., Afjehi-Sadat, A., (2000), pp. 313–318.

15. Low, S.R, Gettings, R.J., Liggett, Jr., W.S., Song, J., Rockwell Hardness – A Method-Dependent Standard Reference Material, Proceedings of the 1999 Workshop and Symposium (Charlotte, NC, 11–15 July 1999), Charlotte, NC, 1999.

16. Petik, F., Factors Influencing Hardness Measurement (A Systematic Survey of Research Results), Bureau International de Metrologie Legale, Paris, 1983 (restricted distribution).

17. ASTM E 140 – 97, Standard Hardness Conversion Tables for Metals, West Conshohocken, PA, ASTM, 2000.

18. NIST Standard Reference Materials Catalog 1998–99, NIST Special Publication 260, Trahey, N.M., editor, Gaithersburg, MD, January 1998.

19. Low, S.R., Liggett, W.S., Pitchure, D.J., “A New Method of Certifying Standardized Rockwell Hardness Test Blocks," Proceedings of International Symposium on Advances in Hardness Measurement, Standards Press of China, Beijing, China, 1998, 91–96.

20. BIPM / IEC/ IFCC / ISO / IUPAC / IUPAP / OIML: International Vocabulary of Basic and General Terms in Metrology (VIM), Clause 6.10, 1993.

21. Song, J.F., Low, S., Pitchure, D., Germak, A., Desogus, S., Polzin, T., Yang, H.Q., Ishida, H., Barbato, G., “Establishing a World-Wide Unified Rockwell Hardness Scale With Metrological Traceability," Metrologia, 1997, 34, 331–342.

22. Polzin, T., Schwenk, D., contributions from He Li, Hansen, V., Herrmann K., Barbato, G., Germak, A., Ishida, H., Onsinska-Karczmarek, A., Scartazzini, W., Borovsky, J., Elkington, D., Low, S., Song, J., Bahng, G.W., World-Wide Unified Scales for the Rockwell Hardness Test with Conical Indenters, Results of the round robin test, differences between the laboratories, Materialprüfung, (42), 2000, S. 460– 467.