Aritmetik of algebra til skolebrug

Chicago citation style
Petersen, Julius, 1839-1910. Aritmetik of algebra til skolebrug. 1885-88. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/000207440. (Accessed October 18, 2018.)
APA citation style
Petersen, Julius, 1839-1910, (1885-88) Aritmetik of algebra til skolebrug. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/000207440
MLA citation style
Petersen, Julius, 1839-1910. Retrieved from the Digital Public Library of America <http://catalog.hathitrust.org/Record/000207440>.
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