Dyfyniad APA

Biophysical Economics and Sustainability. [s.n.].

Dyfyniad Arddull Chicago

Biophysical Economics and Sustainability. [S.l.]: [s.n.].

Dyfyniad MLA

Biophysical Economics and Sustainability. [s.n.].

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.