Selective service regulations :
prescribed by the President under the authority vested in him by the terms of the Selective Service Law (Act of Congress approved May 18, 1917, with supplementary and amendatory acts and resolutions).

APA Citation

United States. Office of the Provost Marshal General., United States., United States. War Department., United States. President (1913-1921 : Wilson). (1918). Selective service regulations: prescribed by the President under the authority vested in him by the terms of the Selective Service Law (Act of Congress approved May 18, 1917, with supplementary and amendatory acts and resolutions). 2nd ed. Washington, D.C.: [U.S.] G.P.O..

MLA Citation

United States. Office of the Provost Marshal General, United States, United States. War Department, and United States. President (1913-1921 : Wilson). Selective Service Regulations: Prescribed by the President Under the Authority Vested In Him by the Terms of the Selective Service Law (Act of Congress Approved May 18, 1917, With Supplementary And Amendatory Acts And Resolutions). 2nd ed. Washington, D.C.: [U.S.] G.P.O., 1918.

Warning: These citations may not always be complete (especially for serials).