Frank, T; Stintzing, F. C.; Carle, R; et al. Urinary pharmacokinetics of betalains following consumption of red beet juice in healthy humans. Pharmacological Research. 2005, 52 (4): 290–7. PMID 15964200. doi:10.1016/j.phrs.2005.04.005.
Urine color. Mayo Clinic, Patient Care and Health Information, Mayo Foundation for Medical Education and Research. 2016 [27 December 2016]. (原始内容存档于2017-09-14).
Frank, T; Stintzing, F. C.; Carle, R; et al. Urinary pharmacokinetics of betalains following consumption of red beet juice in healthy humans. Pharmacological Research. 2005, 52 (4): 290–7. PMID 15964200. doi:10.1016/j.phrs.2005.04.005.
Urine color. Mayo Clinic, Patient Care and Health Information, Mayo Foundation for Medical Education and Research. 2016 [27 December 2016]. (原始内容存档于2017-09-14).