To cite an email, format your reference list entry as follows:
Author's Last Name, First Name. "Subject of Email." Message to the author. Day Mon. Year. Email.
For example:
Smith, Eugene. "Re: Tuesday." Message to the author. 29 Apr. 2009. Email.
To cite a letter, format your reference list entry as follows:
Author's Last Name, First Name. Letter to the author. Day Mon. Year. Letter.
For example:
Smith, Eugene. Letter to the author. 29 Apr. 2009. Letter.
To cite a personal interview, format your reference list entry as follows:
Interviewee's Last Name, First Name. Personal Interview. Day Mon. Year.
For example:
Smith, Eugene. Personal Interview. 29 Apr. 2009.
To cite a public lecture or speech, format your reference list entry as follows:
Speaker's Last Name, First Name. "Title of Speech." Sponsoring Organization, Name of Class or Event. City, State. Day Mon. Year.
For example:
Smith, Eugene. "The Many Models of Early Childhood Education." Harvard University, Psychology 101. Boston, MA. 29 Apr. 2009.