APA (7th ed.) Citation

Gilbert, C. E. (1973). Two presidents: Abraham Lincoln [and] Jefferson Davis. Naylor Co..

Chicago Style (17th ed.) Citation

Gilbert, C. E. Two Presidents: Abraham Lincoln [and] Jefferson Davis. San Antonio, Tex.: Naylor Co., 1973.

MLA (9th ed.) Citation

Gilbert, C. E. Two Presidents: Abraham Lincoln [and] Jefferson Davis. Naylor Co., 1973.