Willoughby, S. S., Bereiter, C., Hilton, P., & Rubinstein, J. H. (1998). SRA math: Explorations and applications. SRA/McGraw-Hill.

Willoughby, Stephen S., Carl Bereiter, Peter Hilton, and Joseph H. Rubinstein. SRA Math: Explorations and Applications. Ohio: SRA/McGraw-Hill, 1998.

Willoughby, Stephen S., et al. SRA Math: Explorations and Applications. SRA/McGraw-Hill, 1998.