@article{201909.0173,
	doi = {},
	url = {https://doi.org/},
	year = 2020,
	month = {April},
	publisher = {Preprints},
	author = {Ulrich Müller and Armin Lude and Dawson R. Hancock},
	title = {Leading Schools towards Sustainability. Fields of Action and Management Strategies for Principals},
	journal = {Preprints}
}