Please, refer to the following links.

http://www.freeengineeringbooks.com/AeroSpace/Aeroelasticity-Books.php

https://www.sanfoundry.com/best-reference-books-aeroelasticity/

Regards

Dear my humble contribution to you:

Good luck

Thank you everyone for your recommendations

I recommend the classic texts that I studied in grad school:

(i) Principles of Aeroelasticity by Bisplinghoff and Ashey

(ii) Aeroelasticity by Bisplinghoff, Ashley and Halfman

A good companion text for the associated structural dynamics is Elements of Vibration Analysis by Meirovitch.

Good luck Pravesh Kumar.

In case that you would like in addition to learn the German language, here is another proposal:

https://link.springer.com/content/pdf/bfm%3A978-3-642-48285-4%2F1.pdf

Petre Augustin: Aeroelasticity