United States. Federal Supply Service. (1930). Supplements to general schedule of supplies, fiscal year 1931, for period Sept. 15, 1930, to June 30, 1931. GPO.
Chicago Style (17th ed.) CitationUnited States. Federal Supply Service. Supplements to General Schedule of Supplies, Fiscal Year 1931, for Period Sept. 15, 1930, to June 30, 1931. [Washington]: GPO, 1930.
MLA (9th ed.) CitationUnited States. Federal Supply Service. Supplements to General Schedule of Supplies, Fiscal Year 1931, for Period Sept. 15, 1930, to June 30, 1931. GPO, 1930.
Warning: These citations may not always be 100% accurate.