Train rules, block signal rules, interlocking rules, signal indications and aspects, general regulations

Chicago citation style
Northern Pacific Railway Company. Train rules, block signal rules, interlocking rules, signal indications and aspects, general regulations. 1919?]. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/102288402. (Accessed September 19, 2018.)
APA citation style
Northern Pacific Railway Company, (1919?]) Train rules, block signal rules, interlocking rules, signal indications and aspects, general regulations. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/102288402
MLA citation style
Northern Pacific Railway Company. Retrieved from the Digital Public Library of America <http://catalog.hathitrust.org/Record/102288402>.
Note: These citations are programmatically generated and may be incomplete.