"Archived copy". uk.geocities.com. Archived from the original on 20 April 2008. Retrieved 14 January 2022.{{cite web}}: CS1 maint: archived copy as title (link)
onb.ac.at
anno.onb.ac.at
OCLC69041409 or see "Hofmeisters Monatsberichte". February 1852. p. 24. Retrieved 22 January 2013.; the somewhat early 1852 listing is consistent with 1851 or 1852 publication.
web.archive.org
"Archived copy". uk.geocities.com. Archived from the original on 20 April 2008. Retrieved 14 January 2022.{{cite web}}: CS1 maint: archived copy as title (link)
worldcat.org
OCLC69041409 or see "Hofmeisters Monatsberichte". February 1852. p. 24. Retrieved 22 January 2013.; the somewhat early 1852 listing is consistent with 1851 or 1852 publication.