•“The doctrine of vocation:Worshiping God & Living out the Great Commission” Matt Heerema, Great Commission Leadership Institute, pg 208-220
•“QuestionsinregardtoVocation”JohnHopler,GreatCommissionLeadershipInstitute Pg 221-224
•“FourTypesofChristians”OsHillmanwww.marketplaceleaders.com
•“Sacred vs secular work” Os Hillman www.marketplaceleaders.com