How do I reference a class lecture in APA?
Generally, this is considered a non-recoverable form of communication - similar to that of an email, a phone conversation, or an interview. Therefore, you would treat this as Personal Communication. What this means is that you will include the information about the lecture within the body of your paper, but you will not have a citation in your reference list.
An example with all information within the sentence could look like this:
During the class lecture on June 15, 2011, Dr. John Doe made reference to the variety of ways students study in the online environment.
OR another example:
During a recent class lecture, a variety of ways students study in the online environment was discussed (J. Doe, Class Lecture, June 15, 2011).
You will find more information in section 6.20 on page 179 of the APA Manual.