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  1. ↑ Villanueva, Cristina M. (2006). "Total and specific fluid consumption as determinants of bladder cancer risk". International Journal of Cancer. 118 (8): 2040–2047. doi:10.1002/ijc.21587.  Parameter |coauthors= tidak diketahui diabaikan (guna |author=) (bantuan); |access-date= memerlukan |url= (bantuan)
  2. ↑ Mekete Belachew, "Coffee," in von Uhlig, Siegbert, ed., Encyclopaedia Aethiopica (Weissbaden: Horrowitz, 2003), p.763.
  3. ↑
  4. ↑ Kummer, Corby (2003). "Caffeine and Decaf". The Joy of Coffee. Houghton Mifflin Cookbooks. m/s. 160–165. ISBN 0618302409. Dicapai 2008-02-23. 
  5. ↑ "Caffeine (Systemic)". MedlinePlus. 2000-05-25. Diarkibkan daripada asal pada 2007-02-23. Dicapai 2006-08-12. 
  6. 1 2 "Caffeine, Breast Cancer Link Minimal". 
  7. ↑ Klatsky, Arthur L. (2006). "Coffee, Cirrhosis, and Transaminase Enzymes". Archives of Internal Medicine. 166 (11): 1190–1195. doi:10.1001/archinte.166.11.1190. PMID 16772246. Dicapai 2008-02-23.  Parameter |coauthors= tidak diketahui diabaikan (guna |author=) (bantuan)

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