One resource that worked well for us was John Timmer’s Four-Dimensional Jesus (Faith Alive Christian Resources). Timmer describes the unique way each of the four gospel writers reveals Jesus and helps us see who Jesus is. One of our members notes that she had many “Aha” moments while we studied it. The book is stimulating and well organized for group discussion. It does not have specific end-of-chapter questions for discussion, but we did not miss them. (Note: This book is out of print and may be found at used book sources like AbeBooks.com.)