Think! In English 2 – Guía del maestro
Autor:Curwen, HildaLIR: Crossover Intro. Secondary. Guía
Autor:Rogers, Paul; Curwen, HildaLIR: Crossover Plus 1. Secondary. Guía
Autor:Rogers, Paul; Curwen, HildaLIR: Crossover Plus 2. Secondary. Guía
Autor:Rogers, Paul; Curwen, HildaLIR: Crossover Plus 3. Secondary. Guía
Autor:Rogers, Paul; Curwen, HildaLIR A: Crossover Plus 2. Secondary
Autor:Pontón, Susana; Curwen, Hilda