Willoughby, S. S., Bereiter, C., Hilton, P., & Rubinstein, J. H. (1998). SRA math: Explorations and applications. SRA/McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Willoughby, Stephen S., Carl Bereiter, Peter Hilton, agus Joseph H. Rubinstein. SRA Math: Explorations and Applications. Ohio: SRA/McGraw-Hill, 1998.
Lua MLA (8ú heag.)Willoughby, Stephen S., et al. SRA Math: Explorations and Applications. SRA/McGraw-Hill, 1998.
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