Mark Evan Bonds - Absolute Music: The History Of An Idea ( Oxford University Press ) 2017

 https://drive.google.com

https://drive.google.com/file/d/1J2ovMwOElNCyHQIzIEQ0YGOKVT-V3f6m/view?usp=sharing

Marcel Cobussen & Nanette Nielsen - Music and Ethics (Ashgate Publishing Company) 2012

 https://drive.google.com

https://drive.google.com/file/d/1uvH18W3sOWKNk5UaZSLg8-2BZhp8OLWA/view?usp=sharing

Kathleen Marie Higgins - The Music of Our Lives ( Lexington Books ) 2011

 https://pt.annas-archive.org/

https://drive.google.com/file/d/1gwJyl_yv1ZeFp60Kb4ka6wYopDVLZu82/view?usp=sharing