The claim that the esterification of a carboxylic acid with an alcohol produces an ester and water is a foundational chemical truism defining Fischer esterification and condensation processes, requiring no further citation.
The claim is a fundamental chemical definition describing the condensation reaction between a carboxylic acid and an alcohol to yield an ester and water. As a basic, universally accepted chemical fact that is trivially true by definition, it falls under common knowledge.