APA (7th ed.) Citation

United States. Federal Supply Service. (1930). Supplements to general schedule of supplies, fiscal year 1931, for period Jan. 1 to June 30, 1931. GPO.

Chicago Style (17th ed.) Citation

United States. Federal Supply Service. Supplements to General Schedule of Supplies, Fiscal Year 1931, for Period Jan. 1 to June 30, 1931. [Washington]: GPO, 1930.

MLA (9th ed.) Citation

United States. Federal Supply Service. Supplements to General Schedule of Supplies, Fiscal Year 1931, for Period Jan. 1 to June 30, 1931. GPO, 1930.