Rooney, P. S., Clarke, P. A., Gifford, K. A., Hardcastle, J. D., & Armitage, N. C. (1993). The identification of high and low risk groups for colorectal cancer using rectal mucosal crypt cell production rate (CCPR). Nature Publishing Group.

Rooney, P. S., P. A. Clarke, K. A. Gifford, J. D. Hardcastle, και N. C. Armitage. The Identification of High and Low Risk Groups for Colorectal Cancer Using Rectal Mucosal Crypt Cell Production Rate (CCPR). Nature Publishing Group, 1993.

Rooney, P. S., et al. The Identification of High and Low Risk Groups for Colorectal Cancer Using Rectal Mucosal Crypt Cell Production Rate (CCPR). Nature Publishing Group, 1993.