Zionism
Book sources - Wikipedia
https://en.wikipedia.org/wiki/Special:BookSources/3-16-148076-7ISBN - Wikipedia
https://en.wikipedia.org/wiki/ISBN_(identifier)The Bar Kokhba War Reconsidered
https://books.google.com/books?id=1TA-Fg4wBnUC&pg=PA283
Rabbinic controversy
Access denied
https://hebrewbooks.org/pdfpager.aspx?req=1426&pgnum=70Responsa Chatam Sofer, Yoreh De'ah 233
https://www.sefaria.org/Responsa_Chatam_Sofer%2C_Yoreh_De'ah.233?lang=bi
Customs and practices
Mourning's End - Understanding Sefira and Lag B'Omer - Beyond BT
https://beyondbt.com/2019/05/22/mournings-end-understanding-sefira-and-lag-bomer/Orach Chayim - Wikipedia
https://en.wikipedia.org/wiki/Orach_ChayimTahanun
https://www.jewishvirtuallibrary.org/tahanun
Origins
The Fire Within - Some thoughts on Lag B’Omer | Rabbi Dovid Orlofsky's Official Website
https://www.rabbiorlofsky.com/blog/2017/3/17/the-fire-within-some-thoughts-on-lag-bomer?rq=fire%20withinBook sources - Wikipedia
https://en.wikipedia.org/wiki/Special:BookSources/3-16-148076-7ISBN - Wikipedia
https://en.wikipedia.org/wiki/ISBN_(identifier)The Bar Kokhba War Reconsidered
https://books.google.com/books?id=1TA-Fg4wBnUC&pg=PA283Access denied
https://hebrewbooks.org/pdfpager.aspx?req=14615&st=&pgnum=144