Chan SS, Tam WH, Yeo W (2007). "A randomised controlled trial of prophylactic levonorgestrel intrauterine system in tamoxifen-treated women". BJOG. 114 (12): 1510–5. doi:10.1111/j.1471-0528.2007.01545.x. PMID17995495.{{cite journal}}: תחזוקה - ציטוט: שימוש בפרמטר authors (link)
Chan SS, Tam WH, Yeo W (2007). "A randomised controlled trial of prophylactic levonorgestrel intrauterine system in tamoxifen-treated women". BJOG. 114 (12): 1510–5. doi:10.1111/j.1471-0528.2007.01545.x. PMID17995495.{{cite journal}}: תחזוקה - ציטוט: שימוש בפרמטר authors (link)