7Williams A., Williams P.J. The effects of the use of learning contracts on student performance in technology teacher training. Research in Science & Technological Education,Vol.17,No.2,1999.
8Margaret C. Lohman, Nicolas H. Woolf.Self -Initiated Learning Activities of Experienced Public School Teachers: methods,sources, and relevant organizational influences[J] .Teachers and Teaching: theory and practice,Vol. 7, No. 1,2001.
9M. S. Knowles. Self-directed Learning:A Guild for Learning and Teachers[M].Toronto:The Adult Education Company, 1975:16-17.
10M.S.Knowles. Using Learning Contracts[M].San Francisco: Jossey-Bass Publishers, 1986:3.