Παραπομπή σε μορφή APA (7η εκδ.)

Naula Guamán, E. E., & González Hurtado, F. E. Grammar reinforcement in the learning of english in the fourth grade in the urban area.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Naula Guamán, Elvia Esperanza, και Fanny Elvira González Hurtado. Grammar Reinforcement in the Learning of English in the Fourth Grade in the Urban Area.

Παραπομπή σε μορφή MLA (8th εκδ.)

Naula Guamán, Elvia Esperanza, και Fanny Elvira González Hurtado. Grammar Reinforcement in the Learning of English in the Fourth Grade in the Urban Area.