1. Oxford Dictionary. Either physical book or online 
2. What is Art? by Noah Dillon, on the Brooklyn Rail. Sep 4th, 2013

• https://brooklynrail.org/2013/09/criticspage/what-is-art-dillon

    3. What is Art? by Dr. Peter Critchley (Abstract) 

• https://www.academia.edu/684069/WHAT_IS_ART

    4. Political Street Art in Social Mobilization: A tale of two protests in Argentina by Holly Eva Ryan p101 pub 2020

• https://www.jstor.org/stable/j.ctvswx8bm.10?seq=1#metadata_info_tab_contents

    5. Religious Art, article on the Crayon Vol 2 No23, Dec 5th, 1855

• https://www.jstor.org/stable/25527306?Search=yes&resultItemClick=true&searchText=Religious+Art+the+Crayon&searchUri=%2Faction%2FdoBasicSearch%3FQuery%3DReligious%2BArt%2Bthe%2BCrayon%26filter%3D&ab_segments=0%2Fbasic_search%2Fcontrol&refreqid=fastly-default%3Aca61c75f30178eb087551a7a8f7ca25c&seq=1#metadata_info_tab_contents

    6. Kunst und Prophetic-Aufsatz von Chritsliche Kunst: eine Sackgasse? by Peter Steiner pub April 10th, 2011

• https://www.herder.de/cig/geistesleben/2011/01-06-2011/kunst-christliche-kunst-eine-sackgasse/