Widiatusch, try the below for the motivation engagement scale:
Liem, G. A. D., & Martin, A. J. (2012). The Motivation and Engagement Scale: Theoretical framework, psychometric properties, and applied yields. Australian Psychologist, 47(1), 3-13.
or the following link: Article The Motivation and Engagement Scale: Theoretical Framework, ...
Best of luck in your efforts in this potentially interesting work.