%0 Journal Article %J Journal of Field Ornithology %D 1992 %T Time budgets of confined nothern cardinals and Harris' sparrows in flocks and differences in observer data %A Shuman, T.W. %A Robel, R.J. %A Kemp, K.E. %A Zimmerman, J.L. %B Journal of Field Ornithology %V 63 %P 129 -137 %G eng %M KNZ00378 %R http://www.jstor.org/stable/4513677