Leonard Cyril Wharton, Folk-Lore (1916)
“ Everything in Bohemian and German traditions points to the White Lady and Bertha being quite separate ideas and essentially different. Certain appearances of Bertha in Bohemian tradition are quoted, and this was taken into the Bohemian cycle very early, and has nothing in common with the other. The White Lady has a very varied origin, one of the most important sources being the belief in the soul. The idea of enchantment is a natural answer to the question why she appears. ”
