Lua APA (7ú heag.)

Freitag, H. T., & Freitag, A. H. (1960). The number story. National Council of Teachers of Mathematics.

Lua i Stíl Chicago (17ú heag.)

Freitag, Herta Taussig, agus Arthur H. Freitag. The Number Story. Washington: National Council of Teachers of Mathematics, 1960.

Lua MLA (8ú heag.)

Freitag, Herta Taussig, agus Arthur H. Freitag. The Number Story. National Council of Teachers of Mathematics, 1960.

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