HELLER P, . (1999). "ESSENTIAL MANAGERS, MAKING DECISIONS (PARTICIPATING FORECASTING LEARNING RISKS ASSESSING PROCESS TRUST - OBJECTIVES ROLES FOCUS- TIMING TIPS SYSTEMS AIMS .". NULL: NULL.
HELLER P, . 1999. "ESSENTIAL MANAGERS, MAKING DECISIONS (PARTICIPATING FORECASTING LEARNING RISKS ASSESSING PROCESS TRUST - OBJECTIVES ROLES FOCUS- TIMING TIPS SYSTEMS AIMS .". NULL: NULL.
HELLER P, . "ESSENTIAL MANAGERS, MAKING DECISIONS (PARTICIPATING FORECASTING LEARNING RISKS ASSESSING PROCESS TRUST - OBJECTIVES ROLES FOCUS- TIMING TIPS SYSTEMS AIMS .". NULL: NULL. 1999.