Greer, P., & Lafferty, G. (2015). 40/40 vision: Clarifying your mission in midlife. IVP Books.
芝加哥风格引文Greer, Peter, 与 Greg Lafferty. 40/40 Vision: Clarifying Your Mission in Midlife. Downers Grove, IL: IVP Books, 2015.
MLA引文Greer, Peter, 与 Greg Lafferty. 40/40 Vision: Clarifying Your Mission in Midlife. IVP Books, 2015.
警告：这些引文格式不一定是100％准确.