Ripple, L., Polemis, B. W., & Alexander, E. (1964). Motivation, capacity, and opportunity: Studies in casework theory and practice. University of Chicago.
Lua i Stíl Chicago (17ú heag.)Ripple, Lilian, Bernice W. Polemis, agus Ernestina Alexander. Motivation, Capacity, and Opportunity: Studies in Casework Theory and Practice. Chicago: University of Chicago, 1964.
Lua MLA (9ú heag.)Ripple, Lilian, et al. Motivation, Capacity, and Opportunity: Studies in Casework Theory and Practice. University of Chicago, 1964.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.