Figure out where the interview should go in your bibliography. The entries for your bibliography should be in alphabetical order by last name of the author. In this case, you should use the last name of the person you interviewed.
Type out the last name of the person you interviewed followed by a comma. Then type the person's first name followed by a period. For example, type "Smith, John."
List the type of interview you conducted followed by a period, such as "Smith, John. Personal interview." Other types include phone or computer-assisted interviews, which may be conducted via email or online chat.
Type the date the interview was conducted after the last period. List the day, then the month and year, such as "5 July 2009." The final bibliography entry for the interview should look something like "Smith, John. Personal interview. 5 July 2009."