Analysis of information sources in references of the Wikipedia article "प्राकृतिक लघुगणक" in Hindi language version.
{{cite book}}: Check date values in: |archive-date= (help), Extract of page 9 Archived 2013-10-09 at the वेबैक मशीन{{cite book}}: Check date values in: |archive-date= (help), Extract of page 9 Archived 2013-10-09 at the वेबैक मशीन