APA (7th ed.) Citation

Gooch, G. P. (1949). History and historians in the nineteenth century. P. Smith.

Chicago Style (17th ed.) Citation

Gooch, G. P. History and Historians in the Nineteenth Century. New York: P. Smith, 1949.

MLA (9th ed.) Citation

Gooch, G. P. History and Historians in the Nineteenth Century. P. Smith, 1949.