1. (1931) Die geographische Verteilung der Blutgruppen und ihre anthropologische Bedeutung. In Comitato Italiano per lo Studio dei Problemi della Populazione. Rome: Istituto Poligrafico dello Stato, pp. 227–243.
2. and (1971) The Genetics of Human Populations. San Francisco: W.H. Freeman.
3. , and (1981) Blood groups and serum protein types in two Brazilian populations. Braz. J. Genet. (in press).
4. Racial admixture in north-eastern Brazil