If your contract is not in writing, then you have to use other admissible evidence to show the court an agreement exists.  That could be:

• Testimony of you and the defendant
• Witness testimony
• Parties course of conduct (i.e., what they did after the alleged agreement)
• Documents, such as emails, letters, and faxes
• Financial statements
• Photos and video
• Websites
• Phone records
• Government records

This list is really endless, as long as the court admits the evidence.  For more information about showing you have an oral agreement, email a San Diego contract lawyer on our contact us page.