Παραπομπή APA

Tolkien,J.R.R, & Tolkien,Christopher. (2009). The legend of Sigurd and Gudrun. Harper collins.

Παραπομπή Chicago Style

Tolkien,J.R.R, και Tolkien,Christopher. The Legend of Sigurd and Gudrun. London: Harper collins, 2009.

Παραπομπή MLA

Tolkien,J.R.R, και Tolkien,Christopher. The Legend of Sigurd and Gudrun. Harper collins, 2009.