Bacal, R. (1999). Performance management. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Bacal, Robert. Performance Management. New York: McGraw-Hill, 1999.
Lua MLA (9ú heag.)Bacal, Robert. Performance Management. McGraw-Hill, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.