<p>When something is not in the book, I ask the professor to verify web interpretations of style sheets. Sometimes, the professor has a preference. Here is an APA FAQ relevant to your question, from OWL:</p>
<p>"How do I cite my lecture notes? </p>
<p>The best approach to citing information from your own personal notes from a class lecture seems to be to consider it as a “personal communication” because it includes “unrecoverable data.” For this reason, personal communications are only cited within the text and are not included in the reference list. </p>
<p>For example, you might say:</p>
<p>In a lecture on November 16, 2002, to a PSY 235 class, Professor Smith said …
… (A. B. Smith, PSY 235 lecture, November 16, 2002)."</p>
<p>However, I think it looks like kissing up to quote lectures in papers. Is the information available in published articles by the professor or others? Can you figure out what the professor's sources were? Primary sources are always better than secondary sources. You might even ask the professor for information on the source.</p>