@inbook{ Valenzuela_Luna-Valero:21-34,

author = { Juan Valenzuela Valdés and Francisco Luna-Valero } ,

title = { Foundations on PBL },

booktitle = { Project Based Learning on Engineering: Foundations, Applications and Challenges },

isbn = { 978-1-63482-217-6 },

publisher = { Nova Publisher },

pages = { 21 - 34 },

year = { 2015 },

}