2019-05-20, ISBN 978-92-822-2272-0 ISO 2955-1974: Information processing - Representations of SI and other units for use in systems with limited character sets
International Standard ISO 31-4: Quantities and units, Part 4: Heat. Annex B (informative): Other units given for information, especially regarding the conversion
Accounting Units and Cataloging Units. U.S. Geological Survey. [2011-03-18]. (原始内容存档于2012-04-27). San Joaquin River. Geographic Names Information System