Posamentier, A. S., & Stepelman, J. (1999). Teaching secondary school mathematics: Techniques and enrichment units (5th ed.). Merrill.
Lua i Stíl Chicago (17ú heag.)Posamentier, Alfred S., agus Jay Stepelman. Teaching Secondary School Mathematics: Techniques and Enrichment Units. 5th ed. Upper Saddle River, N.J: Merrill, 1999.
Lua MLA (9ú heag.)Posamentier, Alfred S., agus Jay Stepelman. Teaching Secondary School Mathematics: Techniques and Enrichment Units. 5th ed. Merrill, 1999.
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