Jeff Iorg is the president of Golden Gate Baptist Theological Seminary. He's just published a new book dealing with understanding the call of God.
I've posted a 15-page sample that you can download from the LifeWay online catalog. This sample includes the title page, contents page, and chapter 8: "The Call to Pastoral Ministry." I recommend you order the book and read the sample while you're waiting on the book to come in the mail.
It's a brief (115 pages) book that you will want to have on hand as you help others (or maybe yourself) process and understand the call of God on your life.
Go to the LifeWay online catalog to download the sample then buy the book.