R. M.  Fraga, ?Cooperative breeding and a case of successive polyandry in the Bay-winged Cowbird?, Auk, vol. 89, pp. 447-449, 1972.

R. M.  Fraga, ?Notas sobre la reproducción del Churrinche (Pyrocephalus rubinus)?, Hornero, vol. 11, pp. 380-383, 1977.

R. M.  Fraga, ?The Rufous-collared Sparrow as a host of the Shiny Cowbird?, Wilson Bulletin, vol. 90, pp. 271-284, 1978.

R. M.  Fraga, ?Differences between nestlings and fledglings of Screaming and Bay-winged cowbirds?, Wilson Bulletin, vol. 91, pp. 151-154, 1979.

R. M.  Fraga, ?The breeding of Rufous Horneros (Furnarius rufus)?, Condor, vol. 82, pp. 58-68, 1980.

R. M.  Fraga, ?Conducta vocal y reproductiva de la Yerut{\'? Común (Leptotila verreauxi) en Lobos, Buenos Aires, Argentina?, Hornero, vol. 12, pp. 89-95, 1983.

R. M.  Fraga, ?Aspectos de la biolog{\'?a reproductiva del picaflor verde común (Chlorostilbon aureoventris)?, Hornero, vol. 12, pp. 156-158, 1984.

R. M.  Fraga, ?Colony sizes and nest tres of Montezuma Oropendolas in Costa Rica?, Journal of Field Ornithology, vol. 60, pp. 289-295, 1989.

R. M.  Fraga, ?Biparental care in Bay-winged Cowbirds Molothrus badius?, Ardea, vol. 80, pp. 389-393, 1991.

J. A.  Amat, Fraga, R. M., and Arroyo, G. M., ?Reuse of nesting scrapes by Kentish Plovers?, Condor, vol. 101, pp. 157-159, 1999.

R. M.  Fraga, ?Ecology, behavior and social organization of Saffron-cowled Blackbirds (Xanthopsar flavus)?, Ornitolog{\'?a Neotropical, vol. 16, pp. 15-29, 2005.