9781323238752 | Exploring Lifespan Development Penn State University Package $ 49.00 MyDevelopmentLab + Ebook - $ 49.00 Textbook Only (New) - $ 89.00 Package - $ 96.00 This variant is currently sold out Textbook ISBN: 9781323238745 Package ISBN: 9781323238752Publisher: Pearson CustomPublished: 2015