Lua APA (7ú heag.)

Littell, M. (1994). Gateways to mathematical investigations (Teacher's ed.). McDougal,Littell & Co..

Lua i Stíl Chicago (17ú heag.)

Littell, McDougal. Gateways to Mathematical Investigations. Teacher's ed. Dallas: McDougal,Littell & Co., 1994.

Lua MLA (9ú heag.)

Littell, McDougal. Gateways to Mathematical Investigations. Teacher's ed. McDougal,Littell & Co., 1994.

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