Leasure, J. William (6 January 1992). "The historical decline of fertility in Eastern Europe". European Journal of Population / Revue Européenne de Démographie. 8 (1). European Journal of Population: 47–75. doi:10.1007/BF01797121. JSTOR20164602. PMID12158997. S2CID3673626.
Leasure, J. William (6 January 1992). "The historical decline of fertility in Eastern Europe". European Journal of Population / Revue Européenne de Démographie. 8 (1). European Journal of Population: 47–75. doi:10.1007/BF01797121. JSTOR20164602. PMID12158997. S2CID3673626.
Leasure, J. William (6 January 1992). "The historical decline of fertility in Eastern Europe". European Journal of Population / Revue Européenne de Démographie. 8 (1). European Journal of Population: 47–75. doi:10.1007/BF01797121. JSTOR20164602. PMID12158997. S2CID3673626.
Leasure, J. William (6 January 1992). "The historical decline of fertility in Eastern Europe". European Journal of Population / Revue Européenne de Démographie. 8 (1). European Journal of Population: 47–75. doi:10.1007/BF01797121. JSTOR20164602. PMID12158997. S2CID3673626.