Niederkofler, B., Herrmann, C., Gerlach, E., & Seelig, H. (2015). What influences motivation in Physical Education? A multilevel approach for identifying climate determinants of achievement motivation. Psychological test and assessment modeling, 57(1), S. 70-93. http://www.psychologie-aktuell.com/fileadmin/download/ptam/1-2015_20150327/05_Niederkofler.pdf

Niederkofler, Benjamin, Christian Herrmann, Erin Gerlach, and Harald Seelig. "What Influences Motivation in Physical Education? A Multilevel Approach for Identifying Climate Determinants of Achievement Motivation." Psychological Test and Assessment Modeling 57, no. 1 (2015): S. 70-93.

Niederkofler, Benjamin, Christian Herrmann, Erin Gerlach, and Harald Seelig. "What Influences Motivation in Physical Education? A Multilevel Approach for Identifying Climate Determinants of Achievement Motivation." Psychological Test and Assessment Modeling 57.1 (2015): S. 70-93.