F. S. Brockman, "A Study of the Moral and Religious Life of Students in the United States," Pedagogical Seminary, September, 1902. Many pitiful narratives are reproduced.
Moraglia, "Die Onanie beim normalen Weibe und bei den Prostituten," Zeitschrift für Criminal-Anthropologie, 1897, p. 489. It should be added that Moraglia is not a very critical investigator. It is probable, however, that on this point his results are an approximation to the truth.
Ernst, "Anthropological Researches on the Population of Venezuela," Memoirs of the Anthropological Society, vol. iii, 1870, p. 277.