Registration certificate : This is to certify that in accordance with the Selective Service Proclamation of the President of the United States [blank for name], [blank for address] has been duly registered this [blank for date] day of [blank for month], 19[blank for year], [blank for registrar], registrar for local board [blank for number], [blank for city], [blank for state] : The law requires that you have this card in your personal possession at all times : D.S.S. form 2 (revised 6/9/41) : 16-21631.
MLA
System, United States. Selective Service. Registration Certificate : This Is to Certify That in Accordance with the Selective Service Proclamation of the President of the United States [Blank for Name], [Blank for Address] Has Been Duly Registered This [Blank for Date] Day of [Blank for Month], 19[Blank for Year], [Blank for Registrar], Registrar for Local Board [Blank for Number], [Blank for City], [Blank for State] : The Law Requires That You Have This Card in Your Personal Possession at All Times : D.S.S. Form 2 (Revised 6/9/41) : 16-21631. 0AD. https://collections.library.yale.edu/catalog/14705198.
APA, 6th edition
System, U. S. S. S. (0 C.E.). Registration certificate : This is to certify that in accordance with the Selective Service Proclamation of the President of the United States [blank for name], [blank for address] has been duly registered this [blank for date] day of [blank for month], 19[blank for year], [blank for registrar], registrar for local board [blank for number], [blank for city], [blank for state] : The law requires that you have this card in your personal possession at all times : D.S.S. form 2 (revised 6/9/41) : 16-21631. [Blank forms--California--San Francisco--1941, Certificates, Identification cards]. https://collections.library.yale.edu/catalog/14705198.