Cita APA

Alfaro, M. d. R. (1993). The Air a Resource Without Borders, discussed in Agenda 21.

Chicago Style Citation

Alfaro, María del Rosario. The Air a Resource Without Borders, Discussed in Agenda 21. 1993.

Cita MLA

Alfaro, María del Rosario. The Air a Resource Without Borders, Discussed in Agenda 21. 1993.

Atenció: Aquestes cites poden no estar 100% correctes.