1987 census of transportation
MLA
Census of transportation (1987). "1987 census of transportation." HathiTrust. 1990, http://hdl.handle.net/2027/umn.319510030856618.
APA
Census of transportation (1987) (1990). 1987 census of transportation. Retrieved from http://hdl.handle.net/2027/umn.319510030856618
Chicago
Census of transportation (1987). "1987 census of transportation." 1990. July 9, 2025. http://hdl.handle.net/2027/umn.319510030856618.