Answer:
An example of an academic source for an informational essay is a legal document.
Step-by-step explanation:
An academic source for an informational essay should be a legal document. This is because an informative essay can only have correct and confirmed information. An informative essay with incorrect or false information would be embarrassing and would take away the credibility of the author of the essay. A legal document is a document that has only accurate, confirmed and correct information, so this is the ideal document type to use as an academic source for an informational essay.