Lloyd, H. (1961). A Manitoba Occurrence of the Black-headed Grosbeak. Zenodo.
Cita Chicago (17th ed.)Lloyd, Hoyes. A Manitoba Occurrence of the Black-headed Grosbeak. Zenodo, 1961.
Cita MLA (9th ed.)Lloyd, Hoyes. A Manitoba Occurrence of the Black-headed Grosbeak. Zenodo, 1961.
Atenció: Aquestes cites poden no estar 100% correctes.