The Sabbath School Quarterly

https://adventech.io/sabbath-school/

The Great Controversy

Book in written form:

https://greatcontroversyproject.org/

Audio Version:

https://ellenwhiteaudio.org/great-controversy/

Lineage offers the book in media episodes:

https://lineagejourney.com/episode_category/the-great-controversy

Lineage is a multi-faceted educational experience that endeavors to take you on a journey showing the stories from our past heritage; the experiences, convictions, sacrifices and commitments of our spiritual forebears that make us who we are today.