Restatement Second of Contracts § 42
Revocation by Communication From Offeror Received by Offeree
Restatement Second of Contracts § 43
Indirect Communication of Revocation
An offeree's power of acceptance is terminated when the offeror takes definite action inconsistent with an intention to enter into the proposed contract and the offeree acquires reliable information to that effect.
Restatement Second of Contracts § 46
Revocation of General Offer
Where an offer is made by advertisement in a newspaper or other general notification to the public or to a number of persons whose identity is unknown to the offeror, the offeree's power of acceptance is terminated when a notice of termination is given publicity by advertisement or other general notification equal to that given to the offer and no better means of notification is reasonably available.