Escalante Araúz, P. (1991). The acquisition of twenty grammatical structures in children learning english as a foreign language in a Costa Rican bilingual elementary school. Escuela de Lenguas Modernas, Universidad de Costa Rica.
Cita Chicago (17th ed.)Escalante Araúz, Patricia. The Acquisition of Twenty Grammatical Structures in Children Learning English as a Foreign Language in a Costa Rican Bilingual Elementary School. San José, Costa Rica: Escuela de Lenguas Modernas, Universidad de Costa Rica, 1991.
Cita MLA (9th ed.)Escalante Araúz, Patricia. The Acquisition of Twenty Grammatical Structures in Children Learning English as a Foreign Language in a Costa Rican Bilingual Elementary School. Escuela de Lenguas Modernas, Universidad de Costa Rica, 1991.