Collins, A., & Dacey, L. S. (2010). Zeroing in on number and operations: Key ideas and common misconceptions, grades 5-6. Stenhouse Publishers.
Lua i Stíl Chicago (17ú heag.)Collins, Anne, agus Linda Schulman Dacey. Zeroing in on Number and Operations: Key Ideas and Common Misconceptions, Grades 5-6. Portland, Me.: Stenhouse Publishers, 2010.
Lua MLA (9ú heag.)Collins, Anne, agus Linda Schulman Dacey. Zeroing in on Number and Operations: Key Ideas and Common Misconceptions, Grades 5-6. Stenhouse Publishers, 2010.
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