1. Host contacted, waiting for reply;Fritsch,1997
2. Perceptions of interaction: the critical predictor in distance education;Fulford;American Journal of Distance Education,1993
3. Teaching in two environments: a case study comparing face-to-face and online instruction;Gonzalez,1995
4. Status and trends of distance education;Holmberg,1981
5. Huelsmann, T. (2000, Fall). Data and analysis of relationship between frequency of online participation and grades of students in University of Maryland Foundations of Distance Education Course [unpublished data].