Hagar, Nick. "How A/B testing can (and can’t) improve your headline writing." Nieman Journalism Lab. Nieman Foundation for Journalism at Harvard, 18 Oct. 2021. Web. 27 May. 2023.
APA
Hagar, N. (2021, Oct. 18). How A/B testing can (and can’t) improve your headline writing. Nieman Journalism Lab. Retrieved May 27, 2023, from https://www.niemanlab.org/2021/10/how-a-b-testing-can-and-cant-improve-your-headline-writing/
Chicago
Hagar, Nick. "How A/B testing can (and can’t) improve your headline writing." Nieman Journalism Lab. Last modified October 18, 2021. Accessed May 27, 2023. https://www.niemanlab.org/2021/10/how-a-b-testing-can-and-cant-improve-your-headline-writing/.
Wikipedia
{{cite web
| url = https://www.niemanlab.org/2021/10/how-a-b-testing-can-and-cant-improve-your-headline-writing/
| title = How A/B testing can (and can’t) improve your headline writing
| last = Hagar
| first = Nick
| work = [[Nieman Journalism Lab]]
| date = 18 October 2021
| accessdate = 27 May 2023
| ref = {{harvid|Hagar|2021}}
}}
