Nielsen, Niels. “Hint to Travellers. Eleventh Edition. Volume Two. Organization and Equipment, Scientific Observation, Health, Sickness, and Injury. Edited by the Secretary. Royal Geographical Society. London 1938. Pris: 16 Sh. (17X12 Cm, 472 S.)”. Geografisk Tidsskrift 41 (januar 1, 1938). Set december 23, 2025. https://tidsskrift.dk/geografisktidsskrift/article/view/48218.