Question

Please Answer

Answer 1

Now by looking at the question, i am gonna guess that it wants MLA format which is very easy.  i'll answer this question for you but for any following question relating to this just fill in the blanks.

Calvin, Dean. "An Expert on the Writings of Twain." Telephone interview. 25 Mar. 2012. The interview lasted 40 minutes

there you go please rate up and thank me helps a lot have a great day and I hope you understand how to do this as it is very important

Answer 2

If this is MLA format then your works cited page should be organized in the following way. 
 Dean Calvin; Expert on writings of Twain; March 25, 2012.
The other information is not typically necessary for your works cited page. 

For APA You would write it as the following 
An interview of 40 minutes over the telephone with the expert on the writings of Twain; Dean Calvin March 25, 2012.