Cita APA

Lappan, G., Smith, M. S., & Jones, E. (2012). Rich & engaging mathematical tasks: Grade 5-9. Reston, Va.: National Council of Teachers of Mathematics.

Citación estilo Chicago

Lappan, Glenda, Margaret S. Smith, y Elizabeth Jones. Rich & Engaging Mathematical Tasks: Grade 5-9. Reston, Va.: National Council of Teachers of Mathematics, 2012.

Cita MLA

Lappan, Glenda, Margaret S. Smith, y Elizabeth Jones. Rich & Engaging Mathematical Tasks: Grade 5-9. Reston, Va.: National Council of Teachers of Mathematics, 2012.