Greer, P., & Lafferty, G. (2015). 40/40 vision: Clarifying your mission in midlife. IVP Books.
Chicagoスタイル(17版)引用形式Greer, Peter, , Greg Lafferty. 40/40 Vision: Clarifying Your Mission in Midlife. Downers Grove, IL: IVP Books, 2015.
MLA(9版)引用形式Greer, Peter, , Greg Lafferty. 40/40 Vision: Clarifying Your Mission in Midlife. IVP Books, 2015.
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