1D. J. Cole, C. Ryan & F. Kicl. Portfolio Across the Curriculum and Beyond. California: Corwin Press, 1995.
2A.E.Seely. Portfolio Assessment California: Teacher Created Materrials Ins. 1994.
3S. Valencia & R.Calfee. The Development and Analysis of Literacy Portfolio for Student , Classes and Teachers. Applied Measurement in Education, 1991 (4).
