| Author(s) | SIPP | CPS | NLSY | Other |
| Commission on Family and Medical Leave | Employee and Employer Survey 1995 |
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| Klerman and Leibowitz | June CPS: 1984, 85, 86 88, 90,92,94,& 95 |
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| Ross | SIPP 1990-93 panels | |||
| Waldfogel, 1998 | March CPS: 1992-95 |
Survey of Income and Program Participation (SIPP), Current Population Survey (CPS)