Frank D. Bean, Harley L. Browning, W. Parker Frisbie, The Sociodemographic Characteristics of Mexican Immigrant Status Groups: Implications for Studying Undocumented Mexicans, The International Migration Review, Vol. 18, No. 3, Special Issue: Irregular Migration: An International Perspective (Autumn, 1984), pp. 672-691
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Bean et al. (1984) studied this question.