Comparison of constraints on ultimate attainment in Second Language Acquisition among children, adolescents and adults.

The complete title would be:
A comparison of constraints on ultimate attainment in SLA among children, adolescents and adults.
Relating it to 1. the critical period,2. Universal Grammar, as well as to linguistic and non linguistic contraints.

Note: The book, or case study by Donna lardiere: Ultimate attainment by Donna Lardiere might be useful.

Important!: please let me know in advanced about which sources are going to be used before starting the actual writin; as I might like to check if I have access to the same sources as well from my University searching machine.