Cita APA (7a ed.)

Greer, P., & Lafferty, G. (2015). 40/40 vision: Clarifying your mission in midlife. IVP Books.

Cita Chicago Style (17a ed.)

Greer, Peter, y Greg Lafferty. 40/40 Vision: Clarifying Your Mission in Midlife. Downers Grove, IL: IVP Books, 2015.

Cita MLA (9a ed.)

Greer, Peter, y Greg Lafferty. 40/40 Vision: Clarifying Your Mission in Midlife. IVP Books, 2015.