APA (7 वां संस्करण) प्रशस्ति पत्र

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

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

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

एमएलए (9वां संस्करण) प्रशस्ति पत्र

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