Tests for gases - Metals and non-metals - Eduqas - GCSE Chemistry (Single Science) Revision - Eduqas [online]. BBC Bitesize, [cit. 2022-09-22]. Dostupné online. (po anglicky)
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SURBER, Christian; HUMBERT, Philippe; ABELS, Christoph. pH of the Skin: Issues and Challenges. [s.l.] : Karger Medical and Scientific Publishers. Dostupné online.ISBN 9783318063851. The Acid Mantle: A Myth or an Essential Part of Skin Health?, s. 3.