Não informado. (1913). University of California journal of agriculture. University of California.
Chicago-referens (17:e uppl.)Não informado. University of California Journal of Agriculture. Berkeley, Calif: University of California, 1913.
MLA-referens (8:e uppl.)Não informado. University of California Journal of Agriculture. University of California, 1913.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.