APA (7th ed.) Citation

Piedra Pullaguari, N., Chicaiza Espinosa, J., Lopez Vargas, J., & Martínez, O. (2010). An approach for description of open educational resources based on semantic technologies.

Chicago Style (17th ed.) Citation

Piedra Pullaguari, N., J. Chicaiza Espinosa, J. Lopez Vargas, and O. Martínez. An Approach for Description of Open Educational Resources Based on Semantic Technologies. 2010.

MLA (9th ed.) Citation

Piedra Pullaguari, N., et al. An Approach for Description of Open Educational Resources Based on Semantic Technologies. 2010.

Warning: These citations may not always be 100% accurate.