APA (7th ed.) Citation

Small, J. K. (1895). A monograph of the North American species of the genus Polygonum. [The New era print].

Chicago Style (17th ed.) Citation

Small, John Kunkel. A Monograph of the North American Species of the Genus Polygonum. [Lancaster, Pa.]: [The New era print], 1895.

MLA (9th ed.) Citation

Small, John Kunkel. A Monograph of the North American Species of the Genus Polygonum. [The New era print], 1895.