Willoughby, S. S., Bereiter, C., Hilton, P., & Rubinstein, J. H. (1998). SRA math: Explorations and applications. SRA/McGraw-Hill.
Dyfyniad Arddull ChicagoWilloughby, Stephen S., Carl Bereiter, Peter Hilton, and Joseph H. Rubinstein. SRA Math: Explorations and Applications. Ohio: SRA/McGraw-Hill, 1998.
Dyfyniad MLAWilloughby, Stephen S., et al. SRA Math: Explorations and Applications. SRA/McGraw-Hill, 1998.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.