Dyfyniad APA

(1987). Renewable sources of energy. Washington D.C: OECD Publications and Information Centre.

Dyfyniad Arddull Chicago

Renewable Sources of Energy. Washington D.C: OECD Publications and Information Centre, 1987.

Dyfyniad MLA

Renewable Sources of Energy. Washington D.C: OECD Publications and Information Centre, 1987.

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