NetLibrary, Inc, Holzer, H., & Lincoln, A. (1998). The Lincoln mailbag: America writes to the President, 1861-1865. Southern Illinois University Press.
Chicago Style (17th ed.) CitationNetLibrary, Inc, Harold Holzer, and Abraham Lincoln. The Lincoln Mailbag: America Writes to the President, 1861-1865. Carbondale, Ill.: Southern Illinois University Press, 1998.
MLA (9th ed.) CitationNetLibrary, Inc, et al. The Lincoln Mailbag: America Writes to the President, 1861-1865. Southern Illinois University Press, 1998.
Warning: These citations may not always be 100% accurate.