WGBH Editorial Guidelines on Journalistic Standards and Practices

https://wgbh.brightspotcdn.com/7f/8c/3b1b92ad478f93896d44a428f108/wgbh-editorial-guidelines.pdf

WGBH Editorial Guidelines (American Experience)

https://www.pbs.org/wgbh/americanexperience/wgbh-editorial-guidelines/

Editorial Standards and Ethics (Frontline)

https://www.pbs.org/wgbh/frontline/about-us/editorial-standards-and-ethics/