Sabbath School Lessons on Church Organization and/or Unity
Unity in Christ by Denis Fortin.
Thirteen lessons on unity in this quarter.
Denis Fortin also wrote a companion book on the same topic, One in Christ: Biblical Concepts for a Doctrine of Church Unity in the Bible Bookshelf series, which is available in Kindle format.
Ellen White Notes for The Book of Acts, third quarter of 2018, Pacific Press version. The “official” version of Ellen White comments on.
Sabbath School Lesson Comments by Ellen White on The Book of Acts, edited by J. L. MalmedeVanAllen. Each 96-page eBook contains one full page of reading for each day – no fillers or advertising, additional references for further study, and much more.
Lesson 6: United in Diversity (lesson from 1999, 4th quarter)