APA (7th ed.) Citation

(1920). Map of Chicago showing local communities with 1920 population. [publisher not identified].

Chicago Style (17th ed.) Citation

Map of Chicago Showing Local Communities with 1920 Population. [Chicago?]: [publisher not identified], 1920.

MLA (8th ed.) Citation

Map of Chicago Showing Local Communities with 1920 Population. [publisher not identified], 1920.

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