APA (7th ed.) Citation

Pilger, T. (1925). New steam boiler exhibited at Leipzig 1925 spring fair. [publisher not identified].

Chicago Style (17th ed.) Citation

Pilger, Theodore. New Steam Boiler Exhibited at Leipzig 1925 Spring Fair. Washington, D.C.: [publisher not identified], 1925.

MLA (9th ed.) Citation

Pilger, Theodore. New Steam Boiler Exhibited at Leipzig 1925 Spring Fair. [publisher not identified], 1925.