APA (7th ed.) Zitazioa
Phillips, J. J. Return on Investment in Training and Performance Improvement Programs. Gulf.
Chicago Style (17th ed.) Zitazioa
Phillips, Jack J. Return on Investment in Training and Performance Improvement Programs. Houston, EUA: Gulf.
MLA (9th ed.) Zitazioa
Phillips, Jack J. Return on Investment in Training and Performance Improvement Programs. Gulf.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.