Iowa. Bureau of Labor Statistics. (1920). The State Free Employment Bureau: Co-operating as the State-Federal Employment Service ; including farm wage data for biennium ending June 30, 1920. State of Iowa.
Chicago Style (17th ed.) CitationIowa. Bureau of Labor Statistics. The State Free Employment Bureau: Co-operating as the State-Federal Employment Service ; Including Farm Wage Data for Biennium Ending June 30, 1920. Des Moines: State of Iowa, 1920.
MLA引文Iowa. Bureau of Labor Statistics. The State Free Employment Bureau: Co-operating as the State-Federal Employment Service ; Including Farm Wage Data for Biennium Ending June 30, 1920. State of Iowa, 1920.
警告：这些引文格式不一定是100％准确.