Dyfyniad APA

Wackernagel, M. (1996). Our ecological footprint: Reducing human impact on the earth. Gabriola Island: New Society Publishers.

Dyfyniad Arddull Chicago

Wackernagel, Mathis. Our Ecological Footprint: Reducing Human Impact On the Earth. Gabriola Island: New Society Publishers, 1996.

Dyfyniad MLA

Wackernagel, Mathis. Our Ecological Footprint: Reducing Human Impact On the Earth. Gabriola Island: New Society Publishers, 1996.

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