The original source for Rolfe's reflective cycle is:
Rolfe, G., Freshwater, D. and Jasper, M. (2001) Critical reflection for nursing and the helping professions: a user's guide. Basingstoke: Palgrave.
You can find this edition in The Hive.
You can find a diagram of Rolfe's reflective cycle on p.45 of the second edition which University of Worcester students and staff can access as an ebook: Rolfe, G., Freshwater, D. and Jasper, M. (2011) Critical reflection for nursing and the helping professions: generating knowledge for care. London: Red Globe Press.