APA (7th ed.) Citation

Comstock, H. (1950). American lithographs of the nineteenth century. Barrows.

Chicago Style (17th ed.) Citation

Comstock, Helen. American Lithographs of the Nineteenth Century. New York: Barrows, 1950.

MLA (9th ed.) Citation

Comstock, Helen. American Lithographs of the Nineteenth Century. Barrows, 1950.