@misc{Ruggles2018,
author = {Ruggles, S. and Flood, S. and Goeken, R. and Grover, J. and Meyer, E. and Pacas, J. and Sobek, M.},
title= {IPUMS USA: Version 8.0},
year = {2018},
doi = {10.1007/978-3-319-69892-2_980-1},
}