APA (7th ed.) Citation

Mitchel, J., British Library, & Adam Matthew Digital. (1876). The last conquest of Ireland (perhaps). Adam Matthew Digital.

Chicago Style (17th ed.) Citation

Mitchel, John, British Library, and Adam Matthew Digital. The Last Conquest of Ireland (perhaps). Marlborough, England: Adam Matthew Digital, 1876.

MLA (8th ed.) Citation

Mitchel, John, et al. The Last Conquest of Ireland (perhaps). Adam Matthew Digital, 1876.