Aguirre, A., & Hill, A. G. (1987). Childhood mortality estimates using the preceding birth technique: Some applications and extensions. Centre for Population Studies, London School of Hygiene & Tropical Medicine.

Aguirre, Alejandro, and Allan G. Hill. Childhood Mortality Estimates Using the Preceding Birth Technique: Some Applications and Extensions. London: Centre for Population Studies, London School of Hygiene & Tropical Medicine, 1987.

Aguirre, Alejandro, and Allan G. Hill. Childhood Mortality Estimates Using the Preceding Birth Technique: Some Applications and Extensions. Centre for Population Studies, London School of Hygiene & Tropical Medicine, 1987.