1. FM Enzinger, and SW. Weiss, Soft Tissue Tumours . St Louis: CV Mosby, 1983 ; 676 -695 .
2. Functional Tumors of the Organ of Zuckerkandl
3. GG Glenner, and PM. Grimley, Tumours of the extra-adrenal paraganglion system (including chemoreceptors) . AFIP Fascicle 9. Washington, DC: AFIP, 1974 ; 13 -15 .
4. Paragangliomas of the head and neck region