You may be required to find an article or essay about autobiography in general, as a genre. This can be difficult to do, but the tips on this page will help.
Check the introductions or first chapters of books about autobiography for general essays about the form. For example, look at the first chapter of the following book. All of the subject searches below will retrieve relevant books. You will have to select ones of interest and then see if there are appropriate essays.
All of these sources have essay length articles about autobiography. Keep in mind the focus of the articles will be on the topic of the work.