Cita APA (7th ed.)
(Sep 1983). Spirolaterals. NCTM Student Math Notes.
Cita Chicago (17th ed.)
"Spirolaterals." NCTM Student Math Notes Sep 1983.
Cita MLA (9th ed.)
"Spirolaterals." NCTM Student Math Notes, Sep 1983.
Atenció: Aquestes cites poden no estar 100% correctes.