Greer, P., & Lafferty, G. (2015). 40/40 vision: Clarifying your mission in midlife. IVP Books.
Chicago-čujuhus (17. p.)Greer, Peter, juo Greg Lafferty. 40/40 Vision: Clarifying Your Mission in Midlife. Downers Grove, IL: IVP Books, 2015.
MLA-čujuhus (9. p.)Greer, Peter, juo Greg Lafferty. 40/40 Vision: Clarifying Your Mission in Midlife. IVP Books, 2015.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.