Autor:	Swallen, Jason R., Russell, Louise M., Dill, Richard S., Reeside,, John B., Morrison, J. P. E., Ewers, John C., Cook, Richard K., Walker, Egbert H., Pittman, Margaret, Rappleye, Howard S., McPherson, A. T., Gurney, A. B.
Zdroj:	Journal of the Washington Academy of Sciences, 1954 May 01. 44(5), 157-164.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/24533278 Zobrazit plný text záznamu