Tohutoro APA (7th ed.)
(Sep 1983). Spirolaterals. NCTM Student Math Notes.
Tohutoru Kātū Chicago (17th ed.)
"Spirolaterals." NCTM Student Math Notes Sep 1983.
Tohutoro MLA (9th ed.)
"Spirolaterals." NCTM Student Math Notes, Sep 1983.
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