The USBC has already done all the work for you. If you check out their site, they have formats for every combination. Just select the number of weeks that you need. See link below for more information.
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Visit USBC's website at www.bowl.com and download a 14 team schedule or use software, such as CDE Software's Bowling League Secretary software which include league schedules.
Use the schedules provided by USBC on their website at bowl.com. League software products such as Bowling League Secretary by CDE Software have league schedules built in.