What are the books/papers that clearly explains the CN stretching vibrations in primary, secondary and tertiary amines?

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Gyorgy Banhegyi

https://chem.libretexts.org/LibreTexts/Athabasca_University/Chemistry_360%3A_Organic_Chemistry_II/Chapter_24%3A_Amines_and_Heterocycles/24.10_Spectroscopy_of_Amines

This is specifically on amines

http://www3.uma.pt/jrodrigues/disciplinas/QINO-II/Teorica/IR.pdf

This is a general introduction

http://www.jpharmsci.org/article/S0022-3549(15)35201-1/pdf

this is on amine salts

https://staff.aub.edu.lb/~tg02/IR.pdf

general

http://epgp.inflibnet.ac.in/epgpdata/uploads/epgp_content/S000005CH/P000667/M007497/ET/1459227853CHE_P12_M9_e-Text.pdf

amines at the end

https://www.masterorganicchemistry.com/2016/11/23/quick_analysis_of_ir_spectra/

a very good intorduction to IR interpretation

I hope it helps