Schaeffer, G. A., Bridgeman, B., Golub-Smith, M. L., Lewis, C., Potenza, M. T., & Steffen, M.. (1998). Comparability of paper-and-pencil and computer adaptive test scores on the GRE General Test (No. ETS Research Report 98-38). presented at the August, 1998, Princeton, N.J.: Educational Testing Services.

Schaeffer, G., Bridgeman, B., Golub-Smith, M. L., Lewis, C., Potenza, M. T., & Steffen, M.. (1998). Comparability of paper-and-pencil and computer adaptive test scores on the GRE General Test (GRE Board Professional Report No 95-08P; Educational Testing Service Research Report 98-38). Princeton, NJ: Educational Testing Service.

Schaeffer, G. A., Steffen, M., & Golub-Smith, M. L.. (1993). Introduction of a computer adaptive GRE General test (Research Report 93-57). Princeton NJ: Educational Testing Service.