 
For files `pageflip[1-5].ogg`:
From: https://freesound.org
Author: themfish/theMfish
License: Attribution 3.0 Unported (CC BY 3.0)

For file `button_click.ogg`:
From: https://freesound.org
Author: Christopherderp
License: CC0 1.0 Universal (CC0 1.0)
