1. Louv, R.: The Last Child in the Woods: Saving Children with Nature Deficit Disorder. China Development Press, Beijing (2014)
2. Zhao, J., et al.: A review of birdwatching tourism research at home and abroad. Tourism Tribune 21(12), 85–90 (2006)
3. Zhang, J., et al.: Research on flipped classroom teaching model. J. Dist. Educ. 31(01), 73–78 (2013)
4. Bruner, J.: Play, thought, and language. Peabody J. Educ. 60(3), 60–69 (1983)
5. Piaget, J.: Play, Dreams, and Imitation in Childhood. Routledge, New York (1999)