Trask, C. (2006). It's easy being green: A handbook for earth-friendly living. Gibbs Smith.
Citazione stile Chigago Style (17a edizione)Trask, Crissy. It's Easy Being Green: A Handbook for Earth-friendly Living. Salt Lake City: Gibbs Smith, 2006.
Citatione MLA (9a ed.)Trask, Crissy. It's Easy Being Green: A Handbook for Earth-friendly Living. Gibbs Smith, 2006.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.