APA-referens (7:e uppl.)

Sánchez Calderón, N. S. (2019). Pre-writing graphic organizers and their influence on written production in students of ninth grade EGB at Uunidad Educativa Particular Manuela Cañizares school year 2019-2020.

Chicago-referens (17:e uppl.)

Sánchez Calderón, Norma Susana. Pre-writing Graphic Organizers and Their Influence on Written Production in Students of Ninth Grade EGB at Uunidad Educativa Particular Manuela Cañizares School Year 2019-2020. 2019.

MLA-referens (9:e uppl.)

Sánchez Calderón, Norma Susana. Pre-writing Graphic Organizers and Their Influence on Written Production in Students of Ninth Grade EGB at Uunidad Educativa Particular Manuela Cañizares School Year 2019-2020. 2019.

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