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worldcat.org
SaraS.MorganSaraS., GideonG.KorenGideonG., PinaP.BozzoPinaP., Is caffeine consumption safe during pregnancy?, „Canadian Family Physician”, 59 (4), 2013, s. 361–362, ISSN0008-350X, PMID: 23585600, PMCID: PMC3625078 [dostęp 2018-01-02].
Lisa B.L.B.SignorelloLisa B.L.B., Joseph K.J.K.McLaughlinJoseph K.J.K., Maternal caffeine consumption and spontaneous abortion: a review of the epidemiologic evidence, „Epidemiology (Cambridge, Mass.)”, 15 (2), 2004, s. 229–239, ISSN1044-3983, PMID: 15127917 [dostęp 2018-01-02].