Schredl, M., S. Berres, A. Klingauf, S. Schellhaas, and A. S. Göritz. “The Mannheim Dream Questionnaire (MADRE): Retest Reliability, Age and Gender Effects”. International Journal of Dream Research, vol. 7, no. 2, Oct. 2014, pp. 141-7, doi:10.11588/ijodr.2014.2.16675.