APA-viite (7. p.)

Tekkis, P., Purkayastha, S., Hanna, G., Darzi, A., & McCulloch, P. (2005). Preoperative prediction of lymph node metastases in oesophageal and gastric surgery: A prospective multicentre study.

Chicago-viite (17. p.)

Tekkis, P., S. Purkayastha, G. Hanna, A. Darzi, ja P. McCulloch. Preoperative Prediction of Lymph Node Metastases in Oesophageal and Gastric Surgery: A Prospective Multicentre Study. 2005.

MLA-viite (9. p.)

Tekkis, P., et al. Preoperative Prediction of Lymph Node Metastases in Oesophageal and Gastric Surgery: A Prospective Multicentre Study. 2005.