
Designing Clinical Research: An Epidemiologic Approach: Cummings, Steven R., Browner, Warren S., M.D., Grady, Deborah G., M.D., Hearst, Norman, Newman, Thomas B., M.D., Hulley, Stephen B., Hulley, Stephen B.: 9780781722186: Amazon.com: Books,

Sample Size Calculations in Clinical Research,

Designing Clinical Research: Hulley, Stephen B., Cummings, Steven R., Browner, Warren S., M.D., Grady, Deborah G., M.D., Newman, Thomas B., M.D.: 9780781782104: Amazon.com: Books,

Essentials of Clinical Research | SpringerLink,
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An overview of clinical research: the lay of the land - The Lancet