National Measurement Laboratory (U.S.). Office of Standard Reference Materials & United States. National Bureau of Standards. (1988). NBS standard reference materials catalog. Office of Standard Reference Materials, National Measurement Laboratory, National Bureau of Standards : For sale by the Supt. of Docs., U.S. G.P.O..
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)National Measurement Laboratory (U.S.). Office of Standard Reference Materials و United States. National Bureau of Standards. NBS Standard Reference Materials Catalog. Washington, D.C.: Office of Standard Reference Materials, National Measurement Laboratory, National Bureau of Standards : For sale by the Supt. of Docs., U.S. G.P.O., 1988.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)National Measurement Laboratory (U.S.). Office of Standard Reference Materials و United States. National Bureau of Standards. NBS Standard Reference Materials Catalog. Office of Standard Reference Materials, National Measurement Laboratory, National Bureau of Standards : For sale by the Supt. of Docs., U.S. G.P.O., 1988.