Leatherman Richard W. (2010). Employee Development DVD Series. HRD Press.
Lua i Stíl Chicago (17ú heag.)Leatherman Richard W. Employee Development DVD Series. HRD Press, 2010.
Lua MLA (9ú heag.)Leatherman Richard W. Employee Development DVD Series. HRD Press, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.