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J. M. Ryan: Comparative morphology and evolution of cheek pouches in rodents. In: Journal of morphology. Band 190, Nummer 1, Oktober 1986, S. 27–41, doi:10.1002/jmor.1051900104, PMID 3783717.
R. Frey, D. Reby, G. Fritsch, B. D. Charlton: The remarkable vocal anatomy of the koala (Phascolarctos cinereus): insights into low-frequency sound production in a marsupial species. In: Journal of anatomy. Band 232, Nummer 4, April 2018, S. 575–595, doi:10.1111/joa.12770, PMID 29460389, PMC 5835795 (freier Volltext).
T. R. Grant, P. D. Temple-Smith: Field biology of the platypus (Ornithorhynchus anatinus): historical and current perspectives. In: Philosophical transactions of the Royal Society of London. Series B, Biological sciences. Band 353, Nummer 1372, Juli 1998, S. 1081–1091, doi:10.1098/rstb.1998.0267, PMID 9720106, PMC 1692311 (freier Volltext) (Review).