To cite strat in publications use:
Zhou X (2012). “A Nonparametric Index of Stratification.” Sociological Methodology, 42(1), 365–389. doi:10.1177/0081175012452207, http://smx.sagepub.com/content/42/1/365.short.
Corresponding BibTeX entry:
@Article{,
title = {A Nonparametric Index of Stratification},
author = {Xiang Zhou},
journal = {Sociological Methodology},
year = {2012},
volume = {42},
number = {1},
pages = {365--389},
url = {http://smx.sagepub.com/content/42/1/365.short},
doi = {10.1177/0081175012452207},
}