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Stefanaki C, Stratigos A, Katsambas A (tháng 6 năm 2005). “Topical retinoids in the treatment of photoaging”. J Cosmet Dermatol. 4 (2): 130–4. doi:10.1111/j.1473-2165.2005.40215.x. PMID17166212.
Smith, W; Saba, N (2005). “Retinoids as chemoprevention for head and neck cancer: Where do we go from here?”. Critical reviews in oncology/hematology. 55 (2): 143–52. doi:10.1016/j.critrevonc.2005.02.003. PMID15886010.