James R. King, Reproductive Relationships of the Rufous-Collared Sparrow and the Shiny Cowbird, in The Auk, vol. 90, n. 1, 1973, pp. 19–34, ISSN 0004-8038 (WC · ACNP), JSTOR4084012.
Rosendo M. Fraga, The Rufous-Collared Sparrow as a Host of the Shiny Cowbird, in The Wilson Bulletin, vol. 90, n. 2, 1978, pp. 271–284, ISSN 0043-5643 (WC · ACNP), JSTOR4161057.
James R. King, Reproductive Relationships of the Rufous-Collared Sparrow and the Shiny Cowbird, in The Auk, vol. 90, n. 1, 1973, pp. 19–34, ISSN 0004-8038 (WC · ACNP), JSTOR4084012.
Rosendo M. Fraga, The Rufous-Collared Sparrow as a Host of the Shiny Cowbird, in The Wilson Bulletin, vol. 90, n. 2, 1978, pp. 271–284, ISSN 0043-5643 (WC · ACNP), JSTOR4161057.
James R. King, Reproductive Relationships of the Rufous-Collared Sparrow and the Shiny Cowbird, in The Auk, vol. 90, n. 1, 1973, pp. 19–34, ISSN 0004-8038 (WC · ACNP), JSTOR4084012.
Rosendo M. Fraga, The Rufous-Collared Sparrow as a Host of the Shiny Cowbird, in The Wilson Bulletin, vol. 90, n. 2, 1978, pp. 271–284, ISSN 0043-5643 (WC · ACNP), JSTOR4161057.