877 Walküre jẹ́ plánẹ́tì kékeré ní ibi ìgbàjá ástẹ́rọ́ìdì. Patrick Martinez (22 September 1994). The Observer's Guide to Astronomy:. Cambridge University Press. pp. 294–. ISBN 978-0-521-37945-8. https://books.google.com/books?id=k5iUVz7iFTQC&pg=PA294.