Knowledge, S. f. t. E. o. L. (1920). One Mystery Less. New York.
Chicago Style aipamenaKnowledge, Society for the Extension of Liberal. One Mystery Less. New York, 1920.
MLA aipamenaKnowledge, Society for the Extension of Liberal. One Mystery Less. New York, 1920.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.