V. Pye, N. Taylor, R. Clay-Williams, and J. Braithwaite. BMC research notes, (February 2016)Sample size; Tamaño del efecto; Introductori<br/><br/>Taula amb referències fonamentals.
V. Kosa, D. Chaves-Fraga, N. Keberle, and A. Birukou. International Conference on Information and Communication Technologies in Education, Research, and Industrial Applications, page 43--70. Springer, (2018)