Cita APA

Bula Villalobos, O., & Díaz Ducca, J. A. (2009). Chemcourse 2008: English for chemistry students teaching portfolio. [San José], C.R.

Citación estilo Chicago

Bula Villalobos, Olmedo, y Jenaro Alberto Díaz Ducca. Chemcourse 2008: English for Chemistry Students Teaching Portfolio. [San José], C.R, 2009.

Cita MLA

Bula Villalobos, Olmedo, y Jenaro Alberto Díaz Ducca. Chemcourse 2008: English for Chemistry Students Teaching Portfolio. [San José], C.R, 2009.