Bird, P. (1998). Time management. NTC/Contemporary Publishing.
Cita Chicago (17th ed.)Bird, Polly. Time Management. Lincolnwood (Chicago), Ill: NTC/Contemporary Publishing, 1998.
Cita MLA (9th ed.)Bird, Polly. Time Management. NTC/Contemporary Publishing, 1998.
Atenció: Aquestes cites poden no estar 100% correctes.