Morales Cordero, E. M. 1., Gómez Atencio, S. 1., Retana Mora, C., Rojas Binda, L., & Vargas Gómez Francisco Javier. (2008). English 7: Practice book. [San José], C.R.: Santillana.

Morales Cordero, Elsa María 1955-, Sergio 1971- Gómez Atencio, Carolina Retana Mora, Liana Rojas Binda, and Vargas Gómez Francisco Javier. English 7: Practice Book. [San José], C.R.: Santillana, 2008.

Morales Cordero, Elsa María 1955-, et al. English 7: Practice Book. [San José], C.R.: Santillana, 2008.