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jstor.org
T. E. Tomasi: Echolocation by the Short-Tailed Shrew Blarina brevicauda. In: Journal of Mammalogy. 60. Jahrgang, Nr.4, 1979, S.751–9, doi:10.2307/1380190., JSTOR:1380190
nih.gov
ncbi.nlm.nih.gov
B. M. Siemers, G. Schauermann, H. Turni, S. Von Merten: Why do shrews twitter? Communication or simple echo-based orientation. In: Biology Letters. 5. Jahrgang, Nr.5, 2009, S.593–596, doi:10.1098/rsbl.2009.0378, PMID 19535367, PMC 2781971 (freier Volltext).