APA (7th ed.) Citation

Skidmore, O. &. M. (1992). Chicago central business district, probably plotted circa 1992, from Skidmore Owings & Merrill CAD data. [Skidmore, Owings & Merrill].

Chicago Style (17th ed.) Citation

Skidmore, Owings & Merrill. Chicago Central Business District, Probably Plotted Circa 1992, from Skidmore Owings & Merrill CAD Data. [Chicago]: [Skidmore, Owings & Merrill], 1992.

MLA (8th ed.) Citation

Skidmore, Owings & Merrill. Chicago Central Business District, Probably Plotted Circa 1992, from Skidmore Owings & Merrill CAD Data. [Skidmore, Owings & Merrill], 1992.

Warning: These citations may not always be 100% accurate.