Gaya APA

Placher, W, C. (2005). Callings : Twenty Centuries of Christian Wisdom on Vocation . Grand Rapids, Michigan: William B. Eerdmans Publishing Company.

Gaya MLA

Placher, William, C.. "Callings : Twenty Centuries of Christian Wisdom on Vocation". Grand Rapids, Michigan: William B. Eerdmans Publishing Company, 2005. Academic.