Analysis of information sources in references of the Wikipedia article "Gulf of Tonkin incident" in English language version.
McNamara: "It was just confusion, and events afterward showed that our judgment that we'd been attacked that day was wrong. It didn't happen. And the judgment that we'd been attacked on August 2nd was right. We had been, although that was disputed at the time. So we were right once and wrong once. Ultimately, President Johnson authorized bombing in response to what he thought had been the second attack ? It hadn't occurred, but that's irrelevant to the point I'm making here. He authorized the attack on the assumption it had occurred…"