PurkinjeJ. [E.] (1825) Neue Beiträge zur Kenntniss des Sehens in subjectiver Hinsicht [New contributions to the knowledge of vision in its subjective aspects]. Berlin: Reimer. Paragr. 109–110. [Repr. in Opera omnia, Prague, 1918. P. 118.]
2.
ZusneL. (1987) Eponyms in psychology: dictionary and bibliographic source. New York: Greenwood Press. P. 226.