Hi these links may help
Bob Hughes and types of play - free
Best play publication on Play England
Janet Moyle's book on amazon.co.uk
The Excellence of Play a free sheet
Play and the Early Years and information about the spiral and multi layered nature of play
Tina Bruce's theory of play and the concept of Free Flow -
page 138 of the level 3 EYE handbook (study book for practitioners working in england)
What materials has your tutor given you to research this?
Best wishes xx