APA (7th ed.) Citation

Tolkien, J. R. R., & Tolkien, C. (2009). The legend of Sigurd and Gudrún (De luxe slipcased ed.). HarperCollins.

Chicago Style (17th ed.) Citation

Tolkien, J. R. R., and Christopher Tolkien. The Legend of Sigurd and Gudrún. De luxe slipcased ed. London: HarperCollins, 2009.

MLA (8th ed.) Citation

Tolkien, J. R. R., and Christopher Tolkien. The Legend of Sigurd and Gudrún. De luxe slipcased ed. HarperCollins, 2009.

Warning: These citations may not always be 100% accurate.