1. Tune in, turn off, drop out: Why so many college students abandon science after the introductory courses;Rigden;The Sciences,1991
2. The Problem Iceberg” in science, mathematics, and engineering education: Student explanations for high attrition rates;Seymour;J. Coll. Sci. Teaching,1992
3. Undergraduate problems with teaching and advising in SME majors-Explaining gender differences in attrition rates;Seymour;J. Coll. Sci. Teaching,1992