ENGEL HERBERT. (1990). HOW TO DELEGATE A GUIDE TO GETTING THINGS DONE (2.). JAICO PUBLISHING HOUSE.
Chicago Style aipamenaENGEL HERBERT. HOW TO DELEGATE A GUIDE TO GETTING THINGS DONE. 2. BOMBAY: JAICO PUBLISHING HOUSE, 1990.
MLA aipamenaENGEL HERBERT. HOW TO DELEGATE A GUIDE TO GETTING THINGS DONE. 2. JAICO PUBLISHING HOUSE, 1990.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.