Klein EA, Thompson IM, Lippman SM, Goodman PJ, Albanes D, Taylor PR, Coltman C (2003). "SELECT: the selenium and vitamin E cancer prevention trial". Urologic Oncology. 21 (1): 59–65. doi:10.1016/S1078-1439(02)00301-0. PMID12684129.
Klein EA, Thompson IM, Lippman SM, Goodman PJ, Albanes D, Taylor PR, Coltman C (2003). "SELECT: the selenium and vitamin E cancer prevention trial". Urologic Oncology. 21 (1): 59–65. doi:10.1016/S1078-1439(02)00301-0. PMID12684129.