@article {1863,
	title = {What are You Doing Now? Activity Level Responses and Errors in the American Time Use Survey},
	journal = {Journal of Survey Statistics and Methodology},
	volume = {2},
	year = {2014},
	chapter = {519-537},
	author = {T. Al Baghal and Belli, R.F. and Phillips, A.L. and Ruther, N.}
}