My Father's Business:  Guidelines for Ministry in the Marketplace. 

"There is a great need today among the Lord's people for a way to help businesspeople find their spiritual calling and to train them effectively for the task...an individual may be called by God to business but have a parallel call to ministry at home or on the field. Is it really possible to succeed in business and ministry concurrently? Business and ministry may indeed require distinct skill-sets, but integration is possible through proper training and discipleship."