MLA does not have a prescribed system of headings for books (for more information on headings, please see page 146 in the MLA Style Manual and Guide to Scholarly Publishing, 3rd edition). If you are only using one level of headings, meaning that all of the sections are distinct and parallel and have no additional sections that fit within them, MLA recommends that these sections resemble one another grammatically. For instance, if your headings are typically short phrases, make all of the headings short phrases (and not, for example, full sentences). Otherwise, the formatting is up to you. It should, however, be consistent throughout the document.

If you employ multiple levels of headings (some of your sections have sections within sections), you may want to provide a key of your chosen level headings and their formatting to your instructor or editor.

Sample Section Headings

The following sample headings are meant to be used only as a reference. You may employ whatever system of formatting that works best for you so long as it remains consistent throughout the document.


1. Soil Conservation

1.1 Erosion

1.2 Terracing

2. Water Conservation

3. Energy Conservation

Formatted, unnumbered:

Level 1 Heading: bold, flush left

Level 2 Heading: italics, flush left

Level 3 Heading: centered, bold

Level 4 Heading: centered, italics

Level 5 Heading: underlined, flush left

How to Cite the Purdue OWL in MLA

Entire Website

The Purdue OWL. Purdue U Writing Lab, 2010. Web. Date of access.

Individual Resources

Contributors' names and the last edited date can be found in the orange boxes at the top of every page on the OWL.

Contributors' names. "Title of Resource." The Purdue OWL. Purdue U Writing Lab, Last edited date. Web. Date of access.

Russell, Tony, Allen Brizee, and Elizabeth Angeli. "MLA Formatting and Style Guide." The Purdue OWL. Purdue U Writing Lab, 4 Apr. 2010. Web. 20 July 2010.