A header must be created at the top right hand corner, and this must have your name, a space and the page number. The section headings used to make the essay readable are not sacrosanct. So, you can twist and use them as you deem fit. You can do the numbering with the Arabic number or the roman numerals. But you must insure that you put a period and a space after the numbering before you write the name of the part of the book. When it comes to headings for books, you will not get any specific system as prescribed by mla. If you decide to make use of one level or system of headings for all distinct sections, you must make them to have a semblance in grammar. This entails that if you use short phrase pointers for headings, then it must be the same for all the headings. This means you should not use a short phrase for some and full sentences for others.
Format for entries: A single space is used after any punctuation mark. When dividing a long word or URL onto two lines, put hyphen, slash, or period at the end of the line. Do not add a hyphen to a URL that was not originally there. Never begin a new line with a punctuation mark. Double-space all lines in a bibliography entry. Do not indent the first line of a bibliography entry, indent second and subsequent lines 5 spaces, or 1/2″ ( cm) from the left margin. Please see Chapter 11. Guidelines on How to Write a Bibliography for details.