MAYNARD SMITH, John - HARPER, David. Animal signals. Oxford [u.a.] : Oxford University Press, c2003, 2009. ix, 166 s. Oxford series in ecology and evolution. Dostupné na internetu: <http://www.loc.gov/catdir/enhancements/fy0620/2004296612-d.html> <http://www.loc.gov/catdir/enhancements/fy0620/2004296612-t.html> ISBN 978-0-19-852685-8.