MLA
Mason, Nelson. Questions and Answers on Public International Law : History of Treaties and Private International Law : Compiled for Students. A.M.E. Book Concern Print|[publisher not identified], 1902. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/9289ghx532-cor.
APA, 6th edition
Mason, N. (1902). Questions and answers on public international law : history of treaties and private international law : compiled for students [African American publisher., African American author.]. A.M.E. Book Concern Print|[publisher not identified]; Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/9289ghx532-cor.
Chicago
Mason, Nelson. “Questions and Answers on Public International Law : History of Treaties and Private International Law : Compiled for Students.” African American publisher., African American author. African American Imprints Collection. Philadelphia|[United States]: A.M.E. Book Concern Print|[publisher not identified], 1902. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/9289ghx532-cor.