"Fundamentals of Clinical Trials Third Edition", by Friedman, Furber, and DeMets; published by Springer Verlag, 1998.

"Data Monitoring Committees in Clinical Trials A Practical Perspective", by Ellenberg, Fleming, and DeMets; published by John Wiley and Sons, 2002.

"Data Monitoring in Clinical Trials A Case Studies Approach", by DeMets, Furberg, and Friedman; published by Springer, 2006.

"Introduction to Statistical Methods for Clinical Trials", by Cook and DeMets, published by Chapman & Hall/CRC, 2008.