Evans, W. H. (1902). Agricultural investigations in the island possessions of the United States. [s.n.].
Cita Chicago (17th ed.)Evans, Walter Harrison. Agricultural Investigations in the Island Possessions of the United States. Washington: [s.n.], 1902.
Cita MLA (9th ed.)Evans, Walter Harrison. Agricultural Investigations in the Island Possessions of the United States. [s.n.], 1902.
Atenció: Aquestes cites poden no estar 100% correctes.