Living former Chief Ministers of Punjab
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https://www.thehindu.com/news/national/Surjit-Singh-Barnala-passes-away/article17040243.ece
List of chief ministers of Punjab (India)
Book sources - Wikipedia
https://en.wikipedia.org/wiki/Special:BookSources/978-81-8038-559-9International Standard Book Number - Wikipedia
https://en.wikipedia.org/wiki/ISBN_(identifier)Durga Das Basu - Wikipedia
https://en.wikipedia.org/wiki/Durga_Das_Basu