Gaya APA

Steel, B, S. et al (2003). Enviromental Politics and Policy : A Comparative Approach (Cet.1 ; Ed.1). USA: McGrawhill.

Gaya MLA

Steel, Brent, S. et al. "Enviromental Politics and Policy : A Comparative Approach". Cet.1 ; Ed.1 USA: McGrawhill, 2003. Text.