"Common courtesy" refers to polite and respectful behavior that people should show towards others in everyday situations. It involves being kind, considerate, and showing good manners. Full definition
Thank you notes are not just common courtesy; they are essential elements of the interviewing process. (biginterview.com)
However, if you use other works as sources of information and data, make sure to cite them as common courtesy and to avoid misrepresentation. (rocketlawyer.com)
Adding the translator in the metadata is a requirement for public domain books, and is common courtesy for copyrighted books. (publishdrive.com)