Gray, D. &. O. (2016). A Critical introduction to Coaching & Mentoring. Sage Publication.
Lua i Stíl Chicago (17ú heag.)Gray, David & Others. A Critical Introduction to Coaching & Mentoring. London: Sage Publication, 2016.
Lua MLA (9ú heag.)Gray, David & Others. A Critical Introduction to Coaching & Mentoring. Sage Publication, 2016.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.