Gronlund, M M; Salminen, S; Mykkanen, H; Kero, P; Lehtonen, O P (1999). "Development of intestinal bacterial enzymes in infants-- relationship to mode of delivery and type of feeding". APMIS. 107 (7): 655–660. doi:10.1111/j.1699-0463.1999.tb01455.x. PMID10440061. S2CID23217535.
Gronlund, M M; Salminen, S; Mykkanen, H; Kero, P; Lehtonen, O P (1999). "Development of intestinal bacterial enzymes in infants-- relationship to mode of delivery and type of feeding". APMIS. 107 (7): 655–660. doi:10.1111/j.1699-0463.1999.tb01455.x. PMID10440061. S2CID23217535.
Gronlund, M M; Salminen, S; Mykkanen, H; Kero, P; Lehtonen, O P (1999). "Development of intestinal bacterial enzymes in infants-- relationship to mode of delivery and type of feeding". APMIS. 107 (7): 655–660. doi:10.1111/j.1699-0463.1999.tb01455.x. PMID10440061. S2CID23217535.
Yong E (2016). I contain multitudes: the microbes within us and a grander view of life (First ed.). New York, NY. ISBN978-0-06-236859-1. OCLC925497449.{{cite book}}: CS1 maint: location missing publisher (link)