Donald Fenna (2002), A Dictionary of Weights, Measures, and Units, Oxford University Press, ISBN 0198605226, p. 153. /wiki/ISBN_(identifier)
"Units: L". University of North Carolina. Retrieved 2015-03-28. https://www.unc.edu/~rowlett/units/dictL.html
Carl A. Burtis and David E. BrunsTietz (2014), Fundamentals of Clinical Chemistry and Molecular Diagnostics, 7th ed., Elsevier Health Sciences, ISBN 0323292062, p. 114. /wiki/ISBN_(identifier)
Lela Buckingham (2014), Fundamental Laboratory Mathematics: Required Calculations for the Medical Laboratory Professional, F. A. Davis, ISBN 0803641028, p. 48. /wiki/ISBN_(identifier)
I. P. Alimarin and M. N. Petrikova (2013), Inorganic Ultramicroanalysis, Elsevier, ISBN 1483150488, p. xiv. /wiki/ISBN_(identifier)
Barbara H. Estridge, Anna P. Reynolds, and Norma J. Walters (2000), Basic Medical Laboratory Techniques, 4th ed., Cengage Learning, ISBN 0766812065, p. 32. /wiki/ISBN_(identifier)
Chris Langley and Yvonne Perrie (2014), Maths Skills for Pharmacy: Unlocking Pharmaceutical Calculations, Oxford University Press, ISBN 019968071X, p. 55. /wiki/ISBN_(identifier)