1. Adult Learning: An Overview;Brookfield Stephen.;International Encyclopedia of Education,1995
2. Brookfield, Stephen. Understanding and Facilitating Adult Learning: A Comprehensive Analysis of Principles and Effective Practices. London: Open University Press, 1986.
3. Adult learning in free-choice, environmental settings: What makes it different?
4. Jarvis, Peter, and Colin Griffin. Adult and Continuing Education: Teaching, Learning and Research. London: Taylor & Francis, 2003.
5. Andragogy, Not Pedagogy;Knowles Malcolm S.;Adult Learning,1968