Principles can be written or printed on A4 paper.
If you print, you should sign your name and date and stamp it.
Notify the employer in writing 30 days in advance, without approval.
Extended data:
Resignation letter is a letter written by a resignee when he resigns from his work unit. Also called resignation letter or resignation letter. Resignation letter is a necessary procedure for resignees to resign, which usually consists of five parts: title, title, text, conclusion, signature and date.
Reference link: resignation application