These are the authors mentioned:

Shutterstock with regular license acquired from Centro Sistemi srl
Istock with regular license purchased from BlitheDigital srl
Pexel
Pixabay
Unsplash
FreepiK

Affari foto creata da senivpetro – it.freepik.com
https://www.pexels.com/it-it/foto/ingegnere-che-lavora-con-il-computer-portatile-al-tavolo-3769135/#:~:text=Foto%20di%20Andrea%20Piacquadio%20da%20Pexels
https://www.pexels.com/photo/person-in-blue-long-sleeve-shirt-using-macbook-pro-on-brown-wooden-table-5673496/#:~:text=Photo%20by%20Sora%20Shimazaki%20from%20Pexels
Industrial worker photo created by aleksandarlittlewolf – www.freepik.com