Ellis, B. (1966). Basic concepts of measurement. Univetes.
Chicago-čujuhus (17. p.)Ellis, Brian. Basic Concepts of Measurement. Cambridge: Univetes, 1966.
MLA-čujuhus (9. p.)Ellis, Brian. Basic Concepts of Measurement. Univetes, 1966.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.