@phdthesis{Leasure1962,
author = {Leasure, J.W.},
title= {Factors involved in the decline of fertility in Spain, 1900-1950},
year = {1962},
type = {Ph.D. Thesis},
address = {Princeton},
institution = {Dept of Economics},
publisher = {Princeton University. University Microfilms, Ann Arbor, nr. 63-532},
}