Naranjo
E-Type Structures
Palmer
-E-gram
E  in Love & Work
Pocket E-gram
Riso and Hudson
Understanding E-gram
Discovering Your Type
E-gram Transform.
Baron & Wagele
E-gram Made Easy
Are You My Type?
Keyes
Emotions and E-gram
Hurley & Dobson
What's My Type?
Callahan
E-gram for Youth