4Darkenwald G G, Valentine T. Factor structure of deterrents to public participation in adult education [J]. Adult Education Quarterly, 1985,35 (4) : 177- 193.
5Cross K P. Adults as Learners[M]. San Francis- co : Jossey-Bass, 1981.
6Darkenwald G G, Merriam S B. Adult Education: Foundations of Practice [ M ]. New York Harper Row, 1982.
7Murphy C, Cross C, McGuire D. The motivation of nurses to participate in continuing professional education in Ireland [J]. Continuing Professional Education, 2006,30(5) :365-384.
8Orvis K A, Leffle G P. Individual and contextual factors: An interactionist approach to under- standing employee self-development[J]. Personal- ity and Individual Difference, 2011,51 ( 2 ) : 172- 177.
