1. Professionele Zorg. Aanvulling op niet-professionele zorg en zelfzorg?;Boshouwers,1987
2. Reliability and Validity Assessment;Carmines,1979
3. Test validation;Cronbach,1971
4. Appraisal of Self-Care Agency A.S.A.-Scale;Evers,1989
5. The appraisal of self-care agency A.S.A.-scale. Research program to test reliability and validity;Evers,1986