Pocock SJ. (1983) Clinical trials: A practical approach. Chichester: John Wiley & Sons.
Friedman LM, Furberg CD, Demets D. (1998) Fundamentals of clinical trials, 3rd edition. New York: Springer Verlag.
Senn S. (2002). Cross-over trials in clinical research, 2nd edition. Chichester: John Wiley & Sons.
Jones B, Kenward MG. (2003). Design and analysis of cross-over trials, 2nd edition. London: Chapman and Hall/CRC.