Cita APA

Vallejo, G., & Oliveros, O. (2008). The XXI century guidance and its social responsibility. Web

Citación estilo Chicago

Vallejo, Grisel, and Olga Oliveros. The XXI Century Guidance and Its Social Responsibility. 2008.

Cita MLA

Vallejo, Grisel, and Olga Oliveros. The XXI Century Guidance and Its Social Responsibility. 2008.

Precaución: Estas citas no son 100% exactas.