Most oven manufacturers provide free online manuals for their self-cleaning ovens. One example is the Whirlpool corporation. Using a search engine to find manuals for self-cleaning ovens reveals a direct link for Whirlpool self-cleaning ovens.
Several websites also offer owners manuals for various brands of self-cleaning ovens. An example of such a site is onlinemanualguide.com.
The first step in finding the correct manual for a particular self-cleaning oven is to search the brand name and see if the manufacturer offers manuals online or for order. If the search at the manufacturer's site is unfruitful, the next step is to find a third-party site that offers an operator's manual for the particular brand.