APA

Ludwig E., . (1927). Wilhelm Hohenzollern, the last of the Kaisers. New York: Putnam's Sons.

Chicago

Ludwig Emil, . 1927. Wilhelm Hohenzollern, the last of the Kaisers. New York: Putnam's Sons.

Harvard

Ludwig E., . (1927). Wilhelm Hohenzollern, the last of the Kaisers. New York: Putnam's Sons.

MLA

Ludwig Emil, . Wilhelm Hohenzollern, the last of the Kaisers. New York: Putnam's Sons. 1927.