TY - BOOK AU - Certo, Samuel C. TI - Supervision: concepts and skill-building 6th ed SN - 978-0-07-128673-2. U1 - Circ. 658.3 C418s 2008 6th ed. PY - 2008/// CY - Boston : PB - Mcgraw-Hill/Irwin KW - 1. Personnel management N1 - Includes bibliographical references and index ER -