Lua APA (7ú heag.)
Piper, J. (2007). Don't waste your time. Crossway Books.
Lua i Stíl Chicago (17ú heag.)
Piper, John. Don't Waste Your Time. Wheaton, Ill.: Crossway Books, 2007.
Lua MLA (9ú heag.)
Piper, John. Don't Waste Your Time. Crossway Books, 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.