Aguilar Vásconez, W. D. (2007). Implementing a portafolio-based writing assessment in the level four at the Pontificia Universidad Católica del Ecuador Sede Ambato.
Chicago Style (17. basım) AtıfAguilar Vásconez, Wilson Daniel. Implementing a Portafolio-based Writing Assessment in the Level Four at the Pontificia Universidad Católica Del Ecuador Sede Ambato. 2007.
MLA (9th ed.) AtıfAguilar Vásconez, Wilson Daniel. Implementing a Portafolio-based Writing Assessment in the Level Four at the Pontificia Universidad Católica Del Ecuador Sede Ambato. 2007.
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