Não informado. (2000). Technical news from the National Bureau of Standards. U.S. Department of Commerce.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Technical News from the National Bureau of Standards. Washington: U.S. Department of Commerce, 2000.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Technical News from the National Bureau of Standards. U.S. Department of Commerce, 2000.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.