Citazione APA

World's Columbian Exposition. (1893). Educational exhibit of the World's Columbian Exposition. [s.n.].

Stile di citazione Chicago

World's Columbian Exposition. Educational Exhibit of the World's Columbian Exposition. Chicago: [s.n.], 1893.

Citazione MLA

World's Columbian Exposition. Educational Exhibit of the World's Columbian Exposition. [s.n.], 1893.

Attenzione: Queste citazioni potrebbero non essere precise al 100%.