1. Balling , J.D. Falk , J.H. Aronson , R.A. 1980 Pre-trip Orientations: An Exploration of Their Effects on Learning from a Single Visit Field Trip to a Zoological Park
2. Visitors: Who Does, Who Doesn't, and Why.;Falk;Museum News,1998
3. Are Science Centers and Theme Parks Merging;Friedman;Informal Science Review,1997
4. Gore , L. Mahnken , M. Nordstrom , J. Wells , D. 1980 A profile of Visitors: The Dallas Museum of Natural History.