Health (NIH), Statistics Germaine M. Buck Louis Director and Senior Investigator of the Division of Epidemiology, and Prevention Research (DESPR) Eunice Kennedy Shriver National Institute of Child Health & Human Development (NICHD) National Institutes of; University, Biostatistics Robert W. Platt Associate Professor Departments of Pediatrics and of Epidemiology, and Occupational Health McGill (2011-03-23). Reproductive and Perinatal Epidemiology (на језику: енглески). Oxford University Press, USA. ISBN978-0-19-985774-6.
doi.org
Ghosh, Shampa; Raghunath, Manchala; Sinha, Jitendra Kumar (2017), „Fetus”, Encyclopedia of Animal Cognition and Behavior (на језику: енглески), Springer International Publishing, стр. 1—5, ISBN9783319478296, doi:10.1007/978-3-319-47829-6_62-1