Evans, W. H. (1902). Agricultural investigations in the island possessions of the United States. [s.n.].
Chicago-referens (17:e uppl.)Evans, Walter Harrison. Agricultural Investigations in the Island Possessions of the United States. Washington: [s.n.], 1902.
MLA-referens (9:e uppl.)Evans, Walter Harrison. Agricultural Investigations in the Island Possessions of the United States. [s.n.], 1902.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.