source: No alteration or variation of the terms of the Contract shall be valid unless made in writing and signed by the parties hereto, and no oral understanding or Contract not incorporated here in shall be binding on any of the parties hereto.
target: No alteration or variation of the terms of the Contract shall be valid. Unless they are made in writing and signed by the parties hereto. Oral understanding or Contract not incorporated here in, shall not be binding on any of the parties hereto.
references: No alteration or variation of the terms of the Contract shall be valid. Unless they are made in writing and signed by the parties hereto. Oral understanding or Contract not incorporated here in, shall not be binding on any of the parties hereto.