APA (7th ed.) Citation

Horwill, H. W. (1925). The usages of the American Constitution. Oxford university press, H. Milford.

Chicago Style (17th ed.) Citation

Horwill, H. W. The Usages of the American Constitution. [London]: Oxford university press, H. Milford, 1925.

MLA (9th ed.) Citation

Horwill, H. W. The Usages of the American Constitution. Oxford university press, H. Milford, 1925.