Cita APA

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

Citación estilo Chicago

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

Cita MLA

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

Warning: These citations may not always be 100% accurate.