Cita APA (7th ed.)
Howard, M. D. (1971). Why world evangelism? InterVarsity Press.
Cita Chicago (17th ed.)
Howard, M. David. Why World Evangelism? Downers Grove: InterVarsity Press, 1971.
Cita MLA (9th ed.)
Howard, M. David. Why World Evangelism? InterVarsity Press, 1971.
Atenció: Aquestes cites poden no estar 100% correctes.