APA aipamena

Clarke, H., & Lapper, i. I. (1983). <Os >vikings. Verbo.

Chicago Style aipamena

Clarke, Helen, and il. Ivan Lapper. <Os >vikings. Verbo, 1983.

MLA aipamena

Clarke, Helen, and il. Ivan Lapper. <Os >vikings. Verbo, 1983.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.