Levi, H. (1960). Foundations of geometry and trignometry. Prentice Hall.
Čikaški stil citiranja (17. izdanje)Levi, Howard. Foundations of Geometry and Trignometry. Englewood Cliffs: Prentice Hall, 1960.
MLA način citiranja (9. izdanje)Levi, Howard. Foundations of Geometry and Trignometry. Prentice Hall, 1960.
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