Milton, Hans J.: Recommended Practice for the Use of Metric (SI) Units in Building Design and Construction. U.S. Department of Commerce / National Bureau of Standards, 1977. Teoksen verkkoversio (viitattu 20.2.2021). (englanniksi)
nih.gov
pubmed.ncbi.nlm.nih.gov
Dybkær, René: The tortuous road to the adoption of katal for the expression of catalytic activity by the General Conference on Weights and Measures. Clinical Chemistry, maaliskuu 2002, 48. vsk, nro 3, s. 586–590. PubMed:11861460. ISSN 0009-9147. Artikkelin verkkoversio. Viitattu 20.2.2021.
oup.com
academic.oup.com
Dybkær, René: The tortuous road to the adoption of katal for the expression of catalytic activity by the General Conference on Weights and Measures. Clinical Chemistry, maaliskuu 2002, 48. vsk, nro 3, s. 586–590. PubMed:11861460. ISSN 0009-9147. Artikkelin verkkoversio. Viitattu 20.2.2021.
worldcat.org
Dybkær, René: The tortuous road to the adoption of katal for the expression of catalytic activity by the General Conference on Weights and Measures. Clinical Chemistry, maaliskuu 2002, 48. vsk, nro 3, s. 586–590. PubMed:11861460. ISSN 0009-9147. Artikkelin verkkoversio. Viitattu 20.2.2021.