Dyfyniad APA

Walén, C. (1944). On the theory of sun-spots. Almquist & Wiksels.

Dyfyniad Arddull Chicago

Walén, Claës. On the Theory of Sun-spots. Uppsala, Sweden: Almquist & Wiksels, 1944.

Dyfyniad MLA

Walén, Claës. On the Theory of Sun-spots. Almquist & Wiksels, 1944.

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