This is a good question, but you really do not need to cite your professor's lecture in a paper. Every professor that I have spoken to or graded for was unanimous. Lectures do not need to be cited. Part of the reason for this is because what lectures offer is basic information that everyone in the field knows. However, there is an exception. If your professor has written a book or an article on this topic, then you should go back to the book or article and cite it properly, as you would do with any book or article.
If you believe that you should absolutely cite your professor's lecture, follow the link and it will give you MLA lecture citation. Just in case, ask your professor. Citing a lecture may be unnecessary.
If I understand this correctly, you are writing a paper and you want to cite your professor as one of your sources. I assume that what you want to cite is a lecture that he or she gave.
If that's the case, follow the first link I have provided below for some instructions on how to do that. Scroll down to "Speeches, Lectures, or Other Oral Presentations."
The basic format is
Name of speaker, title (if any), name of meeting, organization presenting it, location, date. The last thing you put is some sort of descriptor like "class lecture."
The first link gives you a general idea of how to do this, along with links to all MLA formats. The second link tells you exactly how to do a class lecture specifically.
MLA format of citation does not have any special method of citation for the works of your professor from any other author. The format of citation depends only on the nature of the source you have cited. For example you are citing some information from a book the way you give reference of this book will remain same whether or not the author of the book is your professor. As a matter of fact, the format of giving reference will remain same even when you are citing from a source authored by yourself.
The purpose of giving reference of sources cited in your paper is to enable the reader to check your paper against the original source, or to get more details from that source. Therefore, it is not common to give references to sources like class room lectures and personal discussions, for which permanent record is not available for checking back. However if your professor or someone else has made a point that is very important for your paper, and for which no record is available, it may be a good practice to acknowledge the source of idea in the main text of the paper giving sufficient details to identify the person concerned. It is also a good practice to identify the professor and other persons who have helped you in writing the paper, and acknowledge the help received from them in a separate section of the paper.
The seventh edition of the MLA Handbook 2009 clearly specifies how to cite a lecture. If you wish to quote your Professor's formal lecture please refer to the following section in the seventh edition of the MLA Handbook 2009:
"Speeches, Lectures, or Other Oral Presentations (including Conference Presentations)
Provide the speaker’s name. Then, give the title of the speech (if any) in quotation marks. Follow with the name of the meeting and organization, the location of the occasion, and the date. Use the descriptor that appropriately expresses the type of presentation (e.g. Address, Lecture, Reading, Keynote speech, Guest Lecture). Remember to use the abbreviation n.p. if the publisher is not known; use n.d. if the date is not known.
Stein, Bob. Computers and Writing Conference. Purdue University. Union Club Hotel, West Lafayette, IN. 23 May 2003. Keynote address."
If, however, the lecture is not a formal one it is not necessary to either quote it in your paper or in the 'works cited' page.