Dyfyniad APA

Petterssen, S. (1956). Weather analysis and forecasting. McGraw hill.

Dyfyniad Arddull Chicago

Petterssen, Sverre. Weather Analysis and Forecasting. New york: McGraw hill, 1956.

Dyfyniad MLA

Petterssen, Sverre. Weather Analysis and Forecasting. McGraw hill, 1956.

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