I would like to take a Richard Hooker approach and look at the topc via Scripture, Tradition and Reason. There should be some mention of Ignatius, but this is not a focus. My own personal perspective is Anglican. Other references can be used with no more than one internet source.
bibliography should include
Bieber, Nancy. Decision-making & Spiritual Discernment: The Sacred Art of Finding Your Way. Quality Pbk. ed. Woodstock, Vt.: SkyLight Paths Pub., 2010. Print.
Kelly, Matthew. Rediscover Catholicism: A Spiritual Guide to Living with Passion & Purpose. New & Exp. 2nd ed. S.l.: Beacon, 2010. Print.
Klimoski, Victor J., and Kevin Neil. Educating Leaders for Ministry: Issues and Responses. Collegeville, Minn.: Liturgical, 2005. Print.
Placher, William C. Callings: Twenty Centuries of Christian Wisdom on Vocation. Grand Rapids, Mich.: W.B. Eerdmans Pub., 2005. Print.
Stevens, R. Paul. The Other Six Days: Vocation, Work, and Ministry in Biblical Perspective. Grand Rapids, Mich.: W.B. Eerdmans ;, 1999. Print.