Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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