1. The length and position of the vermiform appendix;Collins;Ann Surg,1932
2. Acute retrocecal appendicitis;Collins;Arch Surg,1938
3. 71,000 human appendix specimens: a final report summarizing forty years' study;Collins;Am J Proctol,1963
4. The position of the vermiform appendix as ascertained by an analysis of 10,000 cases;Wakeley;J Anat,1933
5. Topography and development of the cecum and appendix;DeGaris;Ann Surg,1941