Ashenfelter, Orley and Rees, Albert. "Frontmatter". Discrimination in Labor Markets, Princeton: Princeton University Press, 1974, pp. i-iv. https://doi.org/10.1515/9781400867066-fm
Ashenfelter, O. & Rees, A. (1974). Frontmatter. In Discrimination in Labor Markets (pp. i-iv). Princeton: Princeton University Press. https://doi.org/10.1515/9781400867066-fm
Ashenfelter, O. and Rees, A. 1974. Frontmatter. Discrimination in Labor Markets. Princeton: Princeton University Press, pp. i-iv. https://doi.org/10.1515/9781400867066-fm
Ashenfelter, Orley and Rees, Albert. "Frontmatter" In Discrimination in Labor Markets, i-iv. Princeton: Princeton University Press, 1974. https://doi.org/10.1515/9781400867066-fm
Ashenfelter O, Rees A. Frontmatter. In: Discrimination in Labor Markets. Princeton: Princeton University Press; 1974. p.i-iv. https://doi.org/10.1515/9781400867066-fm