Richardson, G. R. (2014). Creating a space to grow: Developing your enabling environment outdoors (Second edition.). Routledge.
Chicago-Zitierstil (17. Ausg.)Richardson, Gail Ryder. Creating a Space to Grow: Developing Your Enabling Environment Outdoors. Second edition. London: Routledge, 2014.
MLA-Zitierstil (9. Ausg.)Richardson, Gail Ryder. Creating a Space to Grow: Developing Your Enabling Environment Outdoors. Second edition. Routledge, 2014.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.