There are lots of papers researching technologies and sustainable tourism nowadays. You can start your search by using the keywords.

https://businessblog.trivago.com/must-read-hospitality-books/

Sudhir KS Yadav It's very nice of your sharing, I'll read it as soon as possible, thanks a lot.

Olga Rauhut Kompaniets Thank you for your sharing, you are so nice.

I suggest you see the works of Freya Higgins-Desbiolles

Mehdi Khademi Gerashi Thank you.This is very helpful to me!

I recommend you the e-book: Turismo pos-COVID-19. Reflexiones, retos y oportunidades

I recommend this website: https://www.e-unwto.org/

Here You can download some books for free.

Create your account and download them.

In Brazil we have some PhD Professors, as well:

Edmur Antonio Stoppa

http://lattes.cnpq.br/1303396760085915

Ricardo Ricci Uvinha

http://lattes.cnpq.br/9022429185170882

Leonardo Giovane Moreira-Gonçalves Giancarlo Gallegos Peralta Danielle Pimentel de Oliveira Thank you for sharing，it did help me a lot.

Searching here in Researchgate with your keywords would be a good start.

Hello dear Lu Jiaxin . I propose this paper: Article Problems and Opportunities in the Hospitality Industry in a ...

or this one: Article Tourism The Great Patient of Coronavirus COVID-2019

even this: Article Gambling Tourism and Economic Development: Some Lessons from Macao

Sotiris Folinas Ian Aik-Soon Ng Thanks for your sharing.