Gifford, R. J., Liu, T. F., Rhee, S., Kiuchi, M., Hue, S., Pillay, D., & Shafer, R. W. (2009). The calibrated population resistance tool: Standardized genotypic estimation of transmitted HIV-1 drug resistance. Oxford University Press.

Gifford, Robert J., Tommy F. Liu, Soo-Yon Rhee, Mark Kiuchi, Stephane Hue, Deenan Pillay, ja Robert W. Shafer. The Calibrated Population Resistance Tool: Standardized Genotypic Estimation of Transmitted HIV-1 Drug Resistance. Oxford University Press, 2009.

Gifford, Robert J., et al. The Calibrated Population Resistance Tool: Standardized Genotypic Estimation of Transmitted HIV-1 Drug Resistance. Oxford University Press, 2009.