1. 1. Black, H. E., Capen, C. C. and Young, D. M. 1973. Ultimobranchial thyroid neoplasms in bulls. Cancer 32: 865-878.
2. 2. Capen, C. C. 2002. Tumors of the endocrine glands. pp. 607-610. In: Tumors in Domestic Animals, 4th ed. (Meuten, D. J. ed.), Blackwell Publishing, Iowa.
3. 3. Capen, C. C. 2002. Tumors and nonneoplastic cysts of the pituitary gland. pp. 610-629. In: Tumors in Domestic Animals, 4th ed. (Meuten, D. J. ed.), Blackwell Publishing, Iowa.
4. 4. Capen, C. C. 2002. Tumors of the adrenal medulla: pheochromocytoma, neuroblastoma, ganglioneuroma. pp. 632-638. In: Tumors in Domestic Animals, 4th ed. (Meuten, D. J. ed.), Blackwell Publishing, Iowa.
5. 5. Capen, C. C. 2002. Tumors of thyroid C (parafollicular) cells (ultimobranchial derivatives): adenoma, carcinoma. pp. 657-664. In: Tumors in Domestic Animals, 4th ed. (Meuten, D. J. ed.), Blackwell Publishing, Iowa.