APA način citiranja (7. izdanje)

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

Čikaški stil citiranja (17. izdanje)

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

MLA način citiranja (8. izdanje)

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