Hoover J. P., Robinson S. K. Retaliatory mafia behavior by a parasitic cowbird favors host acceptance of parasitic eggs (англ.) // Proceedings of the National Academy of Sciences. — 2007. — Vol. 104, no. 11. — P. 4479—4483. — doi:10.1073/pnas.0609710104.
Steadman D. W., Oswald J. A. New species of troupial (Icterus) and cowbird (Molothrus) from ice-age Peru (англ.) // The Wilson Journal of Ornithology. — 2020. — Vol. 132, no. 1. — P. 91–103. — ISSN1559-449. — doi:10.1676/1559-4491-132.1.91.
Steadman D. W., Oswald J. A. New species of troupial (Icterus) and cowbird (Molothrus) from ice-age Peru (англ.) // The Wilson Journal of Ornithology. — 2020. — Vol. 132, no. 1. — P. 91–103. — ISSN1559-449. — doi:10.1676/1559-4491-132.1.91.