Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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