Sutherland, W. J. (1997). Ecological census techniques: A handbook. Univ. Pr.
Chicago-čujuhus (17. p.)Sutherland, William J. Ecological Census Techniques: A Handbook. Cambridge: Univ. Pr, 1997.
MLA-čujuhus (9. p.)Sutherland, William J. Ecological Census Techniques: A Handbook. Univ. Pr, 1997.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.