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}, }