1. C. Colby, K. Bell, Harvard Business Review. The On-Demand Economy Is Growing, and Not Just for the Young and Wealthy, http://goo.gl/LyOlHl (Apr. 2016).
2. Instacart, https://www.instacart.com/.
3. Spinlister, https://www.spinlister.com/.
4. TaskRabbit, https://www.taskrabbit.com/.
5. StyleBee, https://www.stylebee.com/.