Nicholson, B. D., Shinkins, B., Pathiraja, I., Roberts, N. W., James, T. J., Mallett, S., . . . Mant, D. (2015). Blood CEA levels for detecting recurrent colorectal cancer. Cochrane Database Syst Rev.

Nicholson, Brian D., Bethany Shinkins, Indika Pathiraja, Nia W. Roberts, Tim J. James, Susan Mallett, Rafael Perera, John N. Primrose, و David Mant. "Blood CEA Levels for Detecting Recurrent Colorectal Cancer." Cochrane Database Syst Rev 2015.

Nicholson, Brian D., et al. "Blood CEA Levels for Detecting Recurrent Colorectal Cancer." Cochrane Database Syst Rev 2015.