Gas oven parts diagrams are located in the owner's manual for the appliance. Replacements for lost or damaged manuals can usually be found on the manufacturer's website, such as SearsPartsDirect.com for Kenmore models and GEAppliances.com for its Monogram, Profile, Cafe and Artistry lines. ManualsLib.com also has manuals for many brands.
Additional parts diagrams and do-it-yourself repair guides are located on several websites, including ApplianceRepair.net and HowStuffWorks.com. Step-by-step tutorials assist with troubleshooting and diagnosing gas oven problems and list the parts needed for repair. Before beginning any repair or part replacement, disconnect the power supply by removing the fuse or tripping the breaker in the house's main electrical panel and turning off the flow of gas at the shut-off valve.