1. “Krebsmetastasen,”;Walther,1948
2. “Der Bronchial-und Lungenkrebs,”;Wegelin;Schweiz. med. Wchnschr,1942
3. “Pathology of Tumours,”;Willis,1948
4. “Primary Cancer of the Lung,”;Frissel;Am. J. Cancer,1937
5. “Syllabus of Human Neoplasms,”;Mulligan,1951