P.  Maitland, ?The fish fauna of the inland waters of the Outer Hebrides?, Hebrid. Nat., vol. 4, pp. 36?45, 1980.

R. N.  Campbell, ?Sticklebacks (Gasterosteus aculeatus L.) in the Outer Hebrides?, Hebrid. Nat., vol. 3, pp. 8?15, 1979.