Kondo K, Yoshizawa K, Tsuyuguchi M, et al. WHO histologic classification is a prognostic indicator in thymoma. Ann Thorac Surg 2004;77:1183-1188.
Travis, W.D., Brambilla, E., Burke, A.P., Marx, A., Nicholson, A. G. WHO Classification of Tumours of the Lung, Pleura, Thymus and Heart. Fourth edition. 2015