AlexA.LopataAlexA., History of the Egg in Embryology, „Journal of Mammalian Ova Research”, 26 (1), 2009, s. 2–9, DOI: 10.1274/jmor.26.2, ISSN1341-7738.
JuliaJ.LajusJuliaJ., HennH.OjaveerHennH., ErkiE.TammiksaarErkiE., Fisheries at the Estonian Baltic Sea coast in the first half of the 19th century: What can be learned from the archives of Karl Ernst Baer?, „Fisheries Research”, 87 (2–3), 2007, s. 126–136, DOI: 10.1016/j.fishres.2007.07.004.
worldcat.org
AlexA.LopataAlexA., History of the Egg in Embryology, „Journal of Mammalian Ova Research”, 26 (1), 2009, s. 2–9, DOI: 10.1274/jmor.26.2, ISSN1341-7738.