Autor:	Michael, Charles W., Emlen,, John T., Stoner, Emerson A., Stevenson, James O., Willett, G., Orr, Robert T., Price, John B., Friedmann, Herbert, Rowley, J. Stuart, Braly, J. C., Brooks, Allan, Behle, William H., Huey, Laurence M., Peters, James L., Hawbecker, Albert C., Marshall,, Joe T., van Rossem, A. J., Hill, Harold M., Miller, Alden H.
Zdroj:	The Condor, 1938 Mar 01. 40(2), 85-93.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/1363848 Zobrazit plný text záznamu