Carsten-Conner, L. D., A. M. Larson, J. Arseneau, and R. R. Herrick. “Elementary Student Knowledge Gains In The Digital Portable Planetarium”. Journal of Astronomy & Earth Sciences Education (JAESE), vol. 2, no. 2, Nov. 2015, pp. 65-76, doi:10.19030/jaese.v2i2.9511.