APA (7th ed.) Citation

(1921). Amendment No. 4 to Circular No. 137. GPO.

Chicago Style (17th ed.) Citation

Amendment No. 4 to Circular No. 137. [Washington]: GPO, 1921.

MLA (9th ed.) Citation

Amendment No. 4 to Circular No. 137. GPO, 1921.

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