Improving the english teaching-learning process in the seventh grade at Santa María de la Esperanza elementary school with the use of flashcards

由 Calle León, Patricio Rolando, Chuchuca Chérrez, Pablo Francisco
出版 2014

Síndrome meníngeo

由 Crespo, Manuel, Flores, Gerardo, Quizhpe, Arturo, Cherrez T., Francisco
出版 2016