@article{Ryder1967,
author = {Ryder, N.B. and Westoff, C.F.},
title= {The trend of expected parity in the United States: 1955, 1960, 1965},
year = {1967},
doi = {10.2307/2733064},
volume = {33},
number = {2},
pages = {153--168},
}