1. Ali, S. Y. (2002). Portfolio assessment: Motivating ESP students to write better through continuous assessment. In S. Troudi, S. Riley & C. Coombe, C. (Eds.), EFL challenges in the new millennium. TESOL Arabia 2001 Conference Proceedings (Vol. 6).
2. Ali, S. Y. (2005). An introduction to electronic portfolios in the language classroom. The Internet TESL Journal, 11(8). Retrieved from http://iteslj.org .
3. Allen, L. Q. (2004). Implementing a culture portfolio project within a constructivist paradigm. Foreign Language Annals, 37(2), 232–39.
4. Bachman, L. (1990). Fundamental considerations in language testing. Oxford: Oxford University Press.
5. Balhous, R. (2008). The self-assessed portfolio: A case study. Assessment and Evaluation in Higher Education, 33(4), 381–393.