Happiness, Life Satisfaction and Positive Mental Health: Investigating Reciprocal Effects over Four Years in a Chinese Student Sample
A. Bieda, G. Hirschfeld, P. Schoenfeld, J. Brailovskaia, M. Lin, J. Margraf, Journal of Research in Personality 78 (2019) 198–209.

Selecting items for Big Five questionnaires: At what sample size do factor loadings stabilize?
G. Hirschfeld, R. von Brachel, M. Thielsch, Journal of  Research in Personality 53 (2014) 54–63.