Im looking for the following engineering text books. Preferably used. 1.) Human Resource Management in South Africa by S Warnich. ISBN 9781408074220* 2.) Engineering Graphics and Design by J Engelbrecht ISBN 9780981423401 3.) Principles of Operations Management by J Heizer ISBN 9780273787082* 4.) Quality Improvement by Dale Besterfield 9th edition ISBN*9780132624411.