Browne, Nicoletta Christina (December 11, 2013). "No. 6". THEM Anime Reviews. Archived from the original on December 15, 2013. Retrieved April 18, 2021.
Browne, Nicoletta Christina (December 11, 2013). "No. 6". THEM Anime Reviews. Archived from the original on December 15, 2013. Retrieved April 18, 2021.