Kässi, O., Lehdonvirta, V., & Stephany, F. (2021). How many online workers are there in the world? A data-driven assessment. European Commission.
芝加哥风格引文Kässi, O., V. Lehdonvirta, 与 F. Stephany. How Many Online Workers Are There in the World? A Data-driven Assessment. European Commission, 2021.
MLA引文Kässi, O., et al. How Many Online Workers Are There in the World? A Data-driven Assessment. European Commission, 2021.
警告：这些引文格式不一定是100％准确.