A Study of Learning-by-Doing in MOOCs through the Integration of Third-Party External Tools: Comparison of Synchronous and Asynchronous Running Modes. - Carlos Alario-Hoyos; Jorge Ruiz-Magaña; Jorge Blasco; Iria Estévez-Ayres; Jesús M. Gallego-Romero; Carlos Delgado Kloos; M. Carmen Fernández Panadero; Raquel M. Crespo García; Florina Almenáres; María-Blanca Ibáñez-Espiga; Julio Villena-Román (J. Univers. Comput. Sci., 2018)