Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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