APA (7th ed.) Citation

Proctor, R. (1906). An Index To The Early Printed Books In The British Museum. Kegan, Trench, Trübner.

Chicago Style (17th ed.) Citation

Proctor, Robert. An Index To The Early Printed Books In The British Museum. London: Kegan, Trench, Trübner, 1906.

MLA (9th ed.) Citation

Proctor, Robert. An Index To The Early Printed Books In The British Museum. Kegan, Trench, Trübner, 1906.