APA aipamena

Martin, R. A., & il. R. Freund, J. I. (1969). As borboletas. Verbo.

Chicago Style aipamena

Martin, Richard A., and J.G. Irving il. R. Freund. As Borboletas. Verbo, 1969.

MLA aipamena

Martin, Richard A., and J.G. Irving il. R. Freund. As Borboletas. Verbo, 1969.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.