Zunker, Mariella, Hanna Katharina Althoff, Julia Apel, Hannah Sophie Lässig, Leonie Schültke, and Michael Schredl. “Comparing Questionnaire and Diary Measures for Eliciting Nightmare Frequency”. International Journal of Dream Research 8, no. 2 (November 13, 2015): 129–134. Accessed October 4, 2022. https://journals.ub.uni-heidelberg.de/index.php/IJoDR/article/view/23395.