, . "Paywall provider Piano raises $22 million." Nieman Journalism Lab. Nieman Foundation for Journalism at Harvard, 10 Jan. 2019. Web. 20 Mar. 2025.
APA
, . (2019, Jan. 10). Paywall provider Piano raises $22 million. Nieman Journalism Lab. Retrieved March 20, 2025, from https://www.niemanlab.org/reading/paywall-provider-piano-raises-22-million/
Chicago
, . "Paywall provider Piano raises $22 million." Nieman Journalism Lab. Last modified January 10, 2019. Accessed March 20, 2025. https://www.niemanlab.org/reading/paywall-provider-piano-raises-22-million/.
Wikipedia
{{cite web
| url = https://www.niemanlab.org/reading/paywall-provider-piano-raises-22-million/
| title = Paywall provider Piano raises $22 million
| last =
| first =
| work = [[Nieman Journalism Lab]]
| date = 10 January 2019
| accessdate = 20 March 2025
| ref = {{harvid||2019}}
}}
