APA-viite (7. p.)

Sybel, H. v., & Duff Gordon, L. (1861). The history and literature of the Crusades. Chapman and Hall.

Chicago-viite (17. p.)

Sybel, Heinrich von, ja Lucie Duff Gordon. The History and Literature of the Crusades. London: Chapman and Hall, 1861.

MLA-viite (8. p.)

Sybel, Heinrich von, ja Lucie Duff Gordon. The History and Literature of the Crusades. Chapman and Hall, 1861.