(FIND AND CITE) Paralegal studies: Rebecca and Stella both own 1973 Pontiac GTOs. They have been working on them together and they are both ready to be painted. Both cars were originally Sunlight Yellow. They have faded and have some rust issues. Estimates on painting, with quality paint (base and clear coat), sanding, and minor body repair have ranged from $6,000 to $8,000. Rebecca got word that Yesenia (a sought-after vehicle painter) would be training others to paint classic vehicles and was willing to paint vehicles for demonstration at the bargain price of $4,000. Rebecca jumped at the chance and entered into a written contract with Yesenia. Rebecca called Stella to tell her the good news. Stella was happy for Rebecca but expressed disappointment that she could not get the same deal. Rebecca, realizing she should probably save her money for school, suggested that she would sell Stella her contract for $300 and then she could get her vehicle painted for the $4,000. Stella was thrilled and paid Rebecca the $300. Rebecca and Stella informed Yesenia that Stella's vehicle would be painted instead, but that there was no difference in the vehicles. Yesenia refused to accept the substitute vehicle, saying she will paint Rebecca's car but not Stella's.

Find three sources of law that will apply to this situation, include with each citation a short summary of the applicable law.